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Details

3B Dermatology Lectures 5 and 6
N/A
153
Medical
Undergraduate 4
04/15/2015

Additional Medical Flashcards

 


 

Cards

Term
What is the general name for any skin disease caused by a fungus?
Definition
Dermatomycosis
Term
What does dimorphic fungi mean?
Definition
That they can exist as both a mould or a yeast
Term
Which has pseudo hyphae, mould or yeast?
Definition
Yeast
Term
What 3 things do fungi need to grow?
Definition
warmth, humidity, low light
Term
Dermatophytosis (tinea) are caused by which 3 important genera?
Definition
Microsporum, trichophyton, epidermophyton
Term
4 types of tinea pedis?
Definition

-interdigital

-mocassin

-inflammatroy/veiculobullous

-ulcerative

Term
Features of tinea mocassin
Definition
-diffuse HK, erythema, scaling/fissures on plantar surface can extend to dorsal surface
Term
Features of interdigital tinea
Definition
- erythema, scaling, fissures, maceration in web spaces, esp 4th and 5th. Pruritus. May spread. Associted with secondary bacterial infection.
Term
Features of vesicular tinea
Definition
- vesicles and pustules that coalesce into bulla on medial foot and interdigital. Pain, intense pruritus.
Term
Features of ulcerative tinea
Definition
-usually exacerbation of interdigital tinea esp in diabetics/immunocompromised. Ulcers and erosions in web spaces, may be secondary bacterial infection (even cellulitis or lymphangitis)
Term
Diagnosis of tinea pedis
Definition

- clinical signs

-skin/nail scraping/cutting

- KOH prep

- Agar plates or dermatophyte test media

- woods light (microsporum fluoresce green and pityriasis yellow)

Term
What is an id reaction?
Definition
generalised acute reaction because of a disorder of the bodys immune response to the original ailment esp in some forms of dermatitis, outer ear infections and eczema.
Term
Two groupings of topical and systemic antifungals?
Definition
azoles, allylamines
Term
Treatment of mocassin tinea pedis
Definition

- keratolytic (whitfields ointment - salicyclic acid and benzoic acid) to hydrate skin

- topical antifungal at night

- may need oral antifungal

 

Term
Treatment of interdigital tinea
Definition

Fungal tx until 2 wks after symptoms gone

may need antibiotic also 

Term
Treatment of vesicular tinea
Definition

- anti-inflam (topical steroid) and antifungal eg resolve plus, may need oral

-antibiotic for secondary infection

moisture reduction

 

Term
Treatment of ulcerativve tinea
Definition

topical antifungals

may need antibiotics for secondary bacterial infection

Term
After excluding non fungal causes of OM (genodermatoses, systemic causes, external insults), which tests can you perform?
Definition

- calcofluor/KOH examination of nail scrapings/subungual debris

or

- PAS stain of nail clippings

Term
4 patterns of OM
Definition

- Superficial white 

-disto-lateral 

-proximal

-total dystrophic

Term
Treatment of OM
Definition

- Oral/topical antifungal

-nail lacquer

-chemical destruction

- laser, PDT

-Avulsion

Term
Candidiasis causes what at the digits?
Definition
Paronychia
Term
Intertrigo refers to what?
Definition
Inflammation of skin folds
Term
Aetiology of chromoblastomycosis?
Definition

- traumatic inoculation of skin with fungus (esp fonsecaea pedrosi or cladophialophora carionii in aus)

- mainly occurs in limbs esp in agricultural work or tropics

Term
Presentation and complications of chromoblastomycosis?
Definition

-cauliflower like mass, may spread up leg. Scales, crusts, ulcerations, nodules as well as pus may be seen.

-Complications: haematogenous spread, brain abscess, lymphatic obstruction

Term
Diagnosis and treatment of chromoblastomycosis?
Definition

- microscopy of scrapings and pus

- itraconazole/posaconazole, voriconazole maybe with terbinafine, SKKI (potassium iodide), cold, heat, surgical 

Term
Aetiology of mycetoma?
Definition
-inoculation with filamentous bacteria (actinomycetoma) or true fungi species (eumycetoma), esp in tropics, rural where people barefoot
Term
Features of mycetoma?
Definition
- painless, indolent, nodules at site of inoculation followed by sinuses that disperce grains of fungus colonies and discharge. Followed long term by tissue and bone destruction
Term
Treatment for actinomycete and eumycete chromoblastomycoses?
Definition

- actino: dapsone, cotrim, rifampicin, streptomycin, amikacin

-Eumycete:azoles, griseofulvin, terbinafine. More prone to requiring surgery, sometimes even amputation

Term
Diagnosis chromoblastomycoses?
Definition
needle apsirate, tissue biopsy, skin scraping under KOH showing medlar bodies, culture on saboraud agar, presence of grains (black or white in eumycotic, white/yellow/pink/red/brown/yellow in actino), x ray showing destruction
Term
What is majocchis granuloma?
Definition
Deep subcutaneous folliculitis caused by a dermatophyte infection (mainly t.rubrum). Causes an erythematous scaly elevated patch.
Term
3 main people who get majocchis granuloma? Treatment?
Definition

- children

-women who shave their legs

- users of potent topical steroids for fungal infections  

- tx is oral terbinfaine

Term
What is tinea incognito?
Definition

Tinea that has its appearance altered by incorrect treatment, eg topical steroids believeing it is dermatitis. This stops itch, but when cream stopped itch comes back however fungus still growing, but they put more cream on to stop the itch increasing spread.

- has less raised and less scaly, but more pustular and irritable look

Term
Diagnosis and treatment of tinea incognito?
Definition

- scraping of skin for microscopy and culture. Should be done after stopping steroid for a few days since this will minimise the surface of the rash otherwise. 

- treatment bland antipruritic lotions and standard fungal treatment

Term
General guidelines for antifungals?
Definition

-continue for 2 weeks after s and s gone, 1 week for terbinafine

- prescribe by generic rather than brand name

-caution with azoles in pregnancy, lactation, warfarin

Term
Wart viruses enter body through? And last how long?
Definition
Through broken skin. few months to years
Term
Treatment methods for warts?
Definition

- keratolytics

-systemic retinoids

-vaccines

-target immune system or virus itself

-keratolytic

-intralesional bleomycin

-hypnosis

-min humidity, prevent spread

-natural remedies like marigolds or bananas

Term
What is molluscum contagiosum?
Definition
A self limiting skin/mucosal membrane infection by a pox virus.
Term
Presentation, distribution and spread of molluscum contagiosum?
Definition

-multiple and grouped discrete pearly, pink, umbilicated, dome shaped papules - few mm in diameter. Contain cheesy material. 

- Affect face, neck, trunk of children and young adults

-spread by contact

Term
Treatment of molluscum contagiosum?
Definition

- none

- chemical

-surgical curette

-laser

 

Term
Of herpes simplex virus i and ii, which is the genital form?
Definition
type ii
Term
Pathophysiology of herpes simplex eruptions?
Definition

Acute vesicular eruption affecting lips and mucous membranes

- crusts form within 24-48 hours

-infection fades in about a week

Term
Where does the herpes simplex virus lay dormant once infected and when does it recur?
Definition

-sensory nerve cell bodies

-decreased immunity, respiratory infection esp

Term
Treatment of herpes simplex?
Definition
topical/oral nativiral therapy
Term
Another name for herpes zoster?
Definition
Shingles
Term
Cause of shingles?
Definition
Typically people who have had chickenpox, virus lies dormant within nerve root bodies and when activated replicates long nerve to skin causing acute, vesicular, sel limiting eruptions along dermatome regions esp thoracic
Term
Treatment of shingles
Definition
rest, antiviral drugs such as acyclovir, valcyclovir, analgesics, topical/oral corticosteroids
Term
Common conditions caused by stap aureus?
Definition
- impetigo, follicultis, furunculosis
Term
Common conditions caused by strep pyogenes?
Definition
-cellulitis, impetigo, necrotising fasciitis
Term
Major conditions caused by corynebacterium?
Definition
-erythasma, pitted keratolysis
Term
Common conditions caused by pseudomonas aeroginosa?
Definition
- hot tub folliculitis, opportunisitic poathogen
Term
Of staph and strep which causes deeper tissue infections usually?
Definition
strep
Term
What is impetigo?
Definition
Skin infection of stratum corneum by staph or strep. Highly contagious, mostly in children.
Term
Presentation of impetigo?
Definition
-small vesicles/pustules which rupture to form erosions
Term
Imeptigo tends to occur?
Definition

-poor hygiene

-crowding

-high humidity/temp

-with other skin conditions

-mostly in children

Term
Treatment of impetigo
Definition

-topical a/b: muupirocin, fusidic acid cream

-oral a/b: ampicillin, erthromycin, cephalosporin

Term
Appearance, causative agent and treatment of bullous impetigo?
Definition

-bulla 1-2cm in diameter, erosion when deroofed

-toxin a from staph

-oral/topical antibiotics

Term
What does erysipelas (st anthonys fire) feel like to touch?
Definition
Peau d'orange (orange peel like)
Term
Cause of erysipelas?
Definition
exotoxin from strep pyogenes groups A,C,G
Term
Presentation, distribution and systemic effects of erysipelas
Definition

- well circumscribed, advancing erythema, odema, tenderness

-face, lower extremities

-malaise, shivering, fever

Term
Treatment of erysipela?
Definition
Oral a/b: penicillin, erythromycin, cephalosporin
Term
Ecthyma refers to what?
Definition
Circumscribed, crusty covered ulceration typically caused by insect bites or minor injury that has become infected with staph or strep (deep form of impetigo) . Mainly seen in lower limbs of people who are debilitated. Tx is topical/oral a/b.
Term
What does folliculitis refer to?
Definition
pustular infection of multiple hair follicles
Term
Of carbuncle and furuncle which means a deep abscess formation in a group of follicles leading to painful suppurating mass?
Definition
Carbuncle (group of hair follicles are infected), furuncle is acute abscess of one hair follicle
Term
Presentation of furunculosis (boil)?
Definition

- bumpy red, pus filled lump (pea to golf ball size) that may be tender/warm/very painful.

-yellow/white centre means its ready to drain pus

-may be fever, swollen lymph nodes or fatigue if systemic

Term
Cellulitis infects which layers of the skin and affects which type of people mainly?
Definition

-dermis and subcutaneous fat infected with strep and/or staph

- older or immunocompromised

Term
Presentation and tx of cellulitis?
Definition

- swelling, redness, local pain

-fever and malaise

-admit, oral/iv a/b: penicillin, cephalosporins

Term
Lymphangitis refers to?
Definition
inflammation of the lymph vessels by strep or staph
Term
Presentation of lymphangitis? Tx ?
Definition

- red line that follows lymph vessels from entry site to lymph nodes

-lymph nodes are enlarged and tender

-impaired lymphatic drainage sometimes

-oral penicillin

Term
What is necrotising fasciitis, what is it usually associated with?
Definition

- mixed bacterial infection of the superficial fascia

- secondary to surgeries like intestinal, alcoholism, drug abuse, DM

 

Term
Tx of necrotising fasciitis?
Definition
aggressive surgical debridement and early systemic anitibiotics
Term
What is erythasma and where does it affect?
Definition
overgrowth of normal skin flora corynebacterium. Presents with dry reddish brown, slightly scaly eruption in skin folds.
Term
Tx of erythasma?
Definition

-antifungals (imidazole)/antibiotics (erythromycin/fusidic acid)

 

 

Term
What is pitted keratolysis caused by?
Definition
Bacteria such as corynebacterium or streptomyces which release proteases which destroys stratum corneum, also can cause malodour
Term
Pitted keratolysis is common when?
Definition
people suffer from hyperhidrosis or wear occlussive footwear
Term
Tx of pitted keratolysis?
Definition

- min sweating

-advise footwear and socks

-topical and/or oral a/b and antifungals

Term
What is tricomycosis axillaris?
Definition

infection of axillary or pubic hair by corynebacterium, presents with concretions on hair shaft

tx shave, benzoyl peroxide wash, topical a/b solution or cream

Term
When pseudomonas infects nails, what presentation does the nail have?
Definition
greenish black, may be onycholysis
Term
Where does pseudomonas usually infect on the skin?
Definition
intertriginous
Term
Diagnosis/tx of pseudomonas infections
Definition

- sweet freshly mowed grass odour

- swab

- vinegar soak

-condys soak

-a/b beta lactam, fluoroquinolones, aminoglycosides

Term
[image]What type of tinea pedis is this?
Definition
Acute ulcerative tinea pedis
Term

[image]

Which type of tinea pedis is this?

Definition
Mocassin tinea pedis
Term

[image]

What tinea pedis is this?

Definition
Vesiculobullous tinea pedis
Term

[image]

Which type of tinea is this?

Definition
Interdigital tinea pedis
Term

[image]

What condition is this?

Definition
candidias of the skin
Term

[image]

What condition is this?

Definition
Intertrigo
Term

[image]

What condition is this?

Definition
Erosio interdigitalis blastomycetica
Term

[image]

What condition is this?

Definition
chromoblastomycosis
Term

[image]

What condition is this?

Definition
Mycetoma
Term

[image]

What condition is this?

Definition
Majocchis granuloma
Term

[image]

What condition is this?

Definition
Tinea incognito
Term

[image]

What condition is this?

Definition
Molluscum contagiosum
Term

[image]

What condition is this?

Definition
Herpes zoster
Term

[image]

What condition is this?

Definition
Impetigo
Term

[image]

What condition is this?

Definition
Bullous impetigo
Term

[image]

What condition is this?

Definition
Erysipela
Term

[image]

What condition is this?

Definition
Ecthyma
Term

[image]

What condition is this?

Definition
Furunculosis
Term

[image]

What condition is this?

Definition
Carbuncle
Term

[image]

What condition is this?

Definition
Lymphangitis
Term

[image]

What condition is this?

Definition
necrotising fasciitis
Term

[image]

What condition is this?

Definition
Erythasma
Term

[image]

What condition is this?

Definition
Pitted keratolysis
Term
What makes mycobacterium different from other bacteria?
Definition

- it has thicker cell wall

-is alcohol and acid fast

Term
5 types of cutaneous TB?
Definition

-TB verrucosa cutis

-lupus vulgaris

-scrofuloderma

-miliary TB

-tuberculid

Term
Cause and presentation of TB verrucosa cutis?
Definition

- direct inoculaion with tb into skin of someone who has previously been infected with mycobacteria

-purplish/brownish red warty groeth esp on knees/elbows/hands/feet/butt

- can clear without tx

Term
Presentation of lupus vulgaris?
Definition

- small sharply defined reddish brown lesions with gelatinous consistency

- persist yrs, can lead to disfigurement or cancer

Term
Cause and presentation of scrofuloderma?
Definition

-result from direct extension of underlyin tb infection of lymph nodes/bone/joints/lungs

- firm painless lesions that ulcerate, may heal themselves afters yrs

Term
Cause, presentation and prognosis of miliary TB?
Definition

- chronic tb infection spread from primary infection via bloodstream esp in immunocompromised

- small red spots that develop ulcers and abscesses, pt generally sick

-prognosis: likely to die even if treated

Term
What is a tuberculid and what are the main types?
Definition

- generalised widespread rash or high degree of immunity to TB because of previous infection

-Erythema induratum (nodules on backs of legs that ulcerate), papulonecrotic (crops of recurrent crusted skin papules), lichen scrofulosorum (extending eruption of small follicular papules in young persons)

Term
When to suspect TB?
Definition

- living or travelled to endemic area

-hx of trauma

-past or fam hx

- lack of a/b response, chronic and non healing (slow growing patch/plaque on exposed site)

 

Term
Diagnosis of TB?
Definition

- hx

-signs and symptoms

examine Lymph nodes/liver/spleen

- chest xray

-mantoux test/quantiferon gold

-biopsy (HistoPathological Examination/special stains/culture in Lowenstein jensen medium/PCR)

-Ancillary evidence

 

Term

What are the main drugs taken for TB?

How are they taken?

Definition

- Rifampin

-isoniazid

-pyrazinamide

-ethambutol

- taken in combination regime (depends on how resistant bacteria are), taken for months at a time

-can use DOTS program to have someone supervise taking meds to prevent missing it

-can also have surgery

Term
What causes buruli ulcer (mycobacterium ulcerans) usually?
Definition

- bites of infected aquatic insects esp rural wetlands in qld and vic

 

 

Term
Presentation of buruli ulcer?
Definition

- firm painless non tender movable subcutaneous papules or nodules on arms or legs. Pt may complain of itching

- nodule ulcerates within 4-8 wks, is undermining 15cm

or more.

-is panniculitis

- May cause osteomyelitis

Term
Tx of mycobacterium ulcerans?
Definition
a/b rifampin and clarithromycin for 12 wks and surgery
Term
Presentation and cause of mycobacterium marinum?
Definition

- contact with organism in salt/fresh water pools/aquariums/lakes (grows at 30-33c, cooler at extremities)

- in 3-5 weeks lesions are baout 1-2.5cm. 

- typically solitary or multiple nodules that are painless on limbs, may appear verrucous looking

- can lead to OM, septic arthritis, tenosynovitis

Term
2 main ways of acquiring syphillis
Definition
congenitally or through sex/blood
Term
Stages of syphillus course
Definition

Primary chancre 10-90 days after exposure

Secondary eruptins 6 weeks to 6 mths after primary chancre

10 -30 years later is tertiary disease

Term
Name of rash caused by the bacteria borellia?
Definition
erythema chronicum migrans
Term
What organism causes creeping larva migrans? What is the tx?
Definition

- hookworm larvae (anclostoma spp.)

- esp on sole of foot, butt, back and thighs, is a pruritiic erythematous, serpiginous burrow

- tx: self healing, liqui nitorgen of leading edge, topical/oral albendazole, oral ivermectin

Term
Which parts of the body does leprosy most affect?
Definition
chronic infectious disease of skin, PNS, eyes, testes, mucous membranes
Term
Majority of leprosy pts in australia are?
Definition
- migrants or indigenous communities
Term
What is the final push strategy for leprosy?
Definition
achieve 1 case / 10000 by providing free MDT, changing societys perception, preventing futher transmission and disability
Term
Major factors influencing leprosy in people?
Definition

- close, frequent contact

- age 10-14 or 30-40, genetics, malnutrition, socio economic status, immune status, males more than females, heat/humidity, overcrowding, endemic area

Term
Transmission of leprosy?
Definition

-contact

-needle

inhalation of droplets

-arthropods

-ingestion

-zoonoses like armadillo (eg in texas, mississippi), chimp, monkey

Term
Moderate immunity results in what type of leprosy?
Definition
- tuberculoid leprosy
Term
Very little immunity results in?
Definition
lepromatous leprosy
Term
3 types of borderline disease of leprosy
Definition

- borderline tuberculoid disease

- borderline borderline disease

- borderline leprosy

Term
Comparison of TT (tuberculoid) and LL (lepromatous) leprosy
Definition

TT : High resistance, few well defined assym sensory/autonomic impairment, ive systemic, +/- organisms, epitheliod cell granulomas, early asymmetrical nerve involvement. self cure, persist, short treatment, children affected, blacks, PB, 80% distribution

 

LL: Low resistnace, multiple variable symmetrical asymptomatic lesions, systemic involvement, +++ organisms, foamy macrophages, late symm nerve involvement, persist progressive prolonged treatment, adults affects, asians, MB, 20% distribution

Term
cardinal features of leprosy?
Definition

- hypopigmented or reddish skin

-lesions with loss of sensation

-peripheral nerve thickening, sensory or motor loss

- m.leprae in lesions

Term
When examining nerves in leprosy what are we looking for?
Definition

- sensory, motor, autonomic dysfunction

-enlargement can be palpable, feeling for irregularity like abscess

-symmetry or asymmetry

- record pain or tenderness

Term
Early diagnosis of leprosy includes?
Definition

Clinical: pedal edema, nasal stuffiness, skin lesion, nerve thickening

Biopsy of skin or nerve stained

Slit and smear taken from ear lobe stained with ZN

Serology - fluorescent antibody absorption

-histamine test

-sweat test

-lepromin test

Term
Bacteriological index refers to?
Definition

- density of bacilli in smears

- 6+ means more than 1000 bacilli in average field

-falls +1 per year

Term
What does morphological index mean?
Definition

- percentage of live bacteria as a measure of total count - percentage of solid staining bacilli after examining 200 red staining elements ling singly

 

Term
Solid fragmented granuar index refers to what?
Definition
no. of bacteria in solid, fragmented and granular form
Term
Complications of not treating leprosy?
Definition

- untreated : reactions, disabilities, deformities, reservoir of infection

 

- during rx: reactions and consequent disability/deformity

 

-Post rx: relapse, disabilities and deformities

Term
Difference betwen type 1 (reversal reaction) and type 2 reactions (vasculitis) in leprosy?
Definition

Type 1 occurs earlier after treatment than type 2, it causes changes in or additional lesions, nerve pain with loss of function occasionally. It is precipitated also by pregnancy or parturition

 

Type 2 doesnt affect lesions, but causes systemic features like fever, malaise, myalgia, jt swelling and pain, and other organ dysfunction. Is also precipitated by infection, injury, stress, vaccine, pregnancy, parturition.

Term
Treatment of leprosy reactions?
Definition

- continue multi drugs + NSAIDs, steroids, thalidomide

-referral, prevention, follow up

 

Term
Sequelae of leprosy
Definition
[image]
Term
Flowchart of signs of disability in leprosy
Definition
[image]
Term
Special features of leprosy?
Definition

- gynocomastia

-histoids

-leonine facies

-ear lobe infiltration

-trophic ulcer

-odema of feet

Term
When to be suspicious of leprosy?
Definition
any undiagnosed chronic skin lesion or neuropathy from an endemic country
Term
4 factors involved in leprosy for a podiatrist to consider?
Definition

symmetrical glove and stocking anaesthesia - lepromatous leprosy

asymmetrical numb feet - tuberculoid leprosy

neuropathic ulceration

sensory, motor, autonmoic dysfunction = dry skin

Term
[image]
Definition
Tuberculosis gumma
Term

[image]

Skin lesions that result from direct extension of underlying TB infection of lymph nodes bone or jts are called?

Definition
scrofuloderma
Term

[image]

Chronic tb infection that has spread from the primary infection to other organs via the bloodstream causes these small red spots. What type of cutaneous tb is it?

Definition
miliary tb
Term

[image]

Occurs after direct inoculation into skin of someone who has been previously infected with tb. What type of cutaneous tb is this?

Definition
Tb verrucosa cutis
Term

[image]

What condition is this?

Definition
Mycobacterium ulcerans (buruli ulcer)
Term

[image]

Name this condition?

Definition
Mycobacterium marinum
Term

[image]

Name this condition?

Definition
Erythema chronicum migrans from borellia bacteria
Term
[image]Name the conidition and organism that causes it
Definition
cutaneous larva migrans, hookworm
Term

[image]

What condition is this?  

Definition
Leprosy
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