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| Round or circular, ringlike;areas of central clearing and an advancing or active margin may be visible |
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"bulls-eye" lesion of annular configuration with central color contrast, often appearing as a violaceous center with a pink halo seperated by a pale ring
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| in a straight line or line-like format |
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| Protruding from the surface; may be broad based or predunculated |
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| wandering, uneven borders |
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| distribution in a dermatome-like fashion |
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| Lesions not distributed in a symmetrical fashion |
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| lesions are coalesced together from smaller into larger areas where the borders may become ill-defined |
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| lesions are distinctly separate from each other with identifiable borders |
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| lesions appear in clusters or groups |
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| appearing within the skin folds |
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| restricted to one particular body area |
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| lesions appearing on areas of the body more sun-exposed than others (i.e., face, neck, forearms) |
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| lesions appear to be distributed in a similar arrangement on differing sides of the body (Figure 3, see slideshow) |
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| a circumscribed discoloration without elevation or depression that may be hypopigmented or pigmented in a range of colors. Palpation is an easy way to classify these lesions—if there is no difference in texture or elevation compared with the surrounding normal skin |
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| These hyperpigmented macules can vary in color from light tan to dark brown, with smooth or variegated borders. Lesion size and number can vary greatly; this condition is observed in approximately 95% of patients with neurofibromatosis type 1 |
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| An acquired disorder typically manifesting on the face and neck, melasma is found predominantly in genetically predisposed women. The condition is worsened by sun and is of idiopathic origin or associated with pregnancy, oral contraceptives, or medications |
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| a phototoxicity secondary to topical contact with lime juice, celery, parsnip, parsley, carrots, or other light-sensitizing botanicals combined with exposure to UV-A light. Macules develop approximately 24 hours after exposure and peak after 48-72 hours. This reaction may present asymptomatically or with burning erythema. The associated postinflammatory hyperpigmentation may last weeks to months. |
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| circumscribed pigmented macules with homogeneous or variegated pigment ranging from tan to black. Lesion location, configuration, and number can identify a population at higher risk of developing lentigo maligna melanoma. |
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| this condition typically presents as symmetrical macular patches of pigmentation loss secondary to the absence of epidermal melanocytes and commonly involves the intertriginous areas, face, dorsal hands, and genitalia. |
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| a solid, elevated lesion measuring up to 1 cm in diameter |
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| A very common finding, are present as a firm fibrous papule. These growths are found most often in women, usually on the anterior lower extremities. Lesion dimpling with lateral compression is a frequent associated clinical finding. |
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| Dermatosis papulosa nigra |
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Definition
| These multiple, small, hyperpigmented, asymptomatic facial papules are found in up to 35% of adult blacks. Histology resembles that of seborrheic keratoses. A familial predisposition exists in approximately 50% of cases, and the chief complaint is often "moles |
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| typically seen in patients younger than age 30 years, these droplike 2- to 10-mm lesions are found on the trunk and proximal extremities in an acute eruption, usually following such infections as streptococcal pharyngitis. This condition may resolve within weeks to months, with recurrent episodes or possible progression to psoriasis vulgaris. |
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Definition
| an idiopathic inflammatory dermatosis of the skin and/or mucous membranes, is characterized by the five Ps: Planar (flat-topped), Pruritic, Polygonal, Purple (violaceous) Papules |
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| These multiple small dome-shaped to filiform skin-colored papules are located on the sulcus or corona of the glans penis. This is a normal anatomic variant with an incidence of up to 50% and may be misinterpreted as condyloma acuminatum. |
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| Seen most commonly in young women, perioral dermatitis presents as papulovesicular, pustular, perioral lesions that typically spare the vermillion border (Figure 5, see slideshow). The etiology may be secondary to medications, cosmetics, or microbial or other trigger factors. The condition is commonly mistaken for acne or seborrheic dermatitis. |
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| urticarial papules and plaques of pregnancy (PUPPP). The most common gestational dermatosis, PUPPP are primarily seen in primigravidas in the third trimester. Approximately 90% of lesions occur on the abdomen, with extension to the trunk. PUPPP is a self-limited disorder that is treated symptomatically. |
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Definition
| are circumscribed, elevated, superficial lesions that measure more than 1 cm in diameter. is often formed by the coalescence of papules |
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| Discoid (nummular) eczema |
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Definition
| typically presenting on the arms and legs, discoid eczema is a chronic, pruritic dermatitis with a multifactorial etiology that occurs in coin-shaped plaques. |
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Definition
| Also known as plaque psoriasis, this most common form presents as well-demarcated elevated plaques of silver-colored scale covering an erythematous base. Commonly affected sites include the scalp, elbows, knees, trunk, and nails. Lesion presence at the parietal scalp and supragluteal folds are pathognomonic for plaque psoriasis. |
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Definition
| is a circumscribed elevated lesion containing pus or a mixture of fluid and leukocytes. |
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| presents in the noninflammatory phase as open and closed comedones. In the inflammatory phase, the condition may manifest as any combination of papules, pustules, cysts, and nodules |
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| Perifollicular pustules develop as a result of inflammatory cell presence in the ostia and wall of hair follicles. The presence of a hair surrounded by a pustule is pathognomonic for the diagnosis of folliculitis. |
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Definition
| elevated solid lesion more than
2 cm in diameter. |
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| Cutaneous T-cell lymphoma (mycosis fungoides) |
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Definition
| This slowly developing T-lymphocyte cutaneous malignancy presents as a subtype of non-Hodgkin lymphoma. The typical presentation is dry, dark patches that can further progress to plaque and tumor stages. Sometimes confused with psoriasis or eczema, the term mycosis fungoides historically referred to the mushroom-cap skin lesions seen in the tumor stage. |
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| A circumscribed collection of free fluid, vesicles can measure up to 1 cm in diameter. |
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| Herpes simplex virus (HSV |
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Definition
| characterized by painful recurrent perioral and perigenital mucosal vesicles, erythema, pustules, and shallow ulceration. |
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| These larger vesicles (blisters) measure more than 10 mm in diameter. |
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| This condition manifests as tense bullae on reddened or normal-appearing skin in the elderly. |
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| Dyshidrotic eczema (pompholyx) |
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Definition
| This type of eczema is associated with atopy and presents as recurrent vesicular or bullous pruritic disorder of the hands (80% of cases) and feet. |
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Definition
| often presenting as grouped erythematous papules with a central punctum, insect bites can progress to pustule formation if secondarily infected. |
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| a transient rounded or flat-topped edematous plaque formed by local dermal edema |
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| White/pink/erythematous edematous migratory pruritic plaques of dermal edema mediated by histamine release are the hallmark of this. Onset is associated with sensitivity related to foods, additives, drugs, infections, inhalants, and pregnancy. |
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Definition
| a circumscribed, elevated solid lesion of varying size, typically between 0.5 cm and 2 cm in diameter. |
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Definition
| This condition manifests as painful, tender, deep, dermal nodules on the anterior shins, typically secondary to an inflammatory disease process, pregnancy, or sulfa drugs |
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Definition
| a skin depression resulting from thinned epidermis and/or dermis. |
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| Topical-steroid-induced striae (striae distensae) |
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Definition
| These marks are a dose-, vehicle-, time-, and location-dependent side effect of corticosteroid application. Laser therapy can somewhat reduce the associated pigment darkening, but atrophic scars are permanent. |
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| Also known as localized scleroderma,is characterized by excessive collagen deposition leading to thickening sclerosis of the dermis and subcutis. This condition has a probable autoimmune etiology |
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| an accumulation of dried serum, blood, or exudate, such as healing abraded skin with eschar. (The lay term is scab.) |
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| Typically found in the dermis, is a sac containing liquid or semisolid material. |
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| Epidermoid inclusion (sebaceous) cysts |
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Definition
| These keratin-
producing sacs are derived from hair-follicle epithelium. |
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Definition
| As seen in genital HSV and aphthous stomatitis, is a focal loss of epidermis above the basal layer. |
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| e is a linear erosion caused by scratching |
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| a loss of epidermis and dermis with sharp borders and nearly vertical walls. |
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| This skin thickening with papules, plaques, and skin-line accentuation is caused by rubbing or scratching and is common in the nuchal scalp, ankles, legs, arms, and anal/genital areas. |
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| This condition is characterized by intense paroxysmal pruritus with circumscribed hyperpigmented plaques of lichenification and often excoriation |
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| a nonblanching circumscribed erythema or violaceous extravasation of blood, typically larger than 0.5 cm in diameter. Examples include: thrombocytopenic purpura, senile (traumatic) purpura |
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| characteristic feature of many dermatophytoses; are made up of dead stratum corneum or keratin produced by abnormal keratinization or shedding |
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Definition
condition is characterized by erythema and scale in areas of increased sebaceous-gland activity; In infants, it is referred to as cradle cap.
Presents as yellowish-red skin with greasy scales around the eyebrows, glabella, and periauricular and presternal areas as well as the hair-bearing regions of the head and butterfly areas of the nose and cheeks |
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| a post-traumatic thickened or abnormal formation of connective tissue |
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| A hypertrophic scar manifesting as a proliferation of dense fibrous tissue due to an overproduction of collagen, they often appear within weeks of an injury. Treatment may include surgical excision, cryosurgery, intralesional steroids, and trauma avoidance (especially body piercing |
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| Found almost exclusively in black men; are occipital keloidlike papules and plaques. The etiology is speculative and possibly includes posterior hairline shaving, curved hair follicles, chronic low-grade bacterial infections, or an autoimmune process. The male-to-female presentation ratio is approximately 20:1. |
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Definition
| Often of idiopathic origin, this disorder is characterized by small, dilated, superficial blood vessels |
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Definition
| esenting with inflammatory papules, pustules and telangiectasias; is a chronic condition whose signs and symptoms overlap with those of acne vulgaris |
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Definition
| Often progressing to multiple scaly-to-verrucous lesions with an erythematous base on sun-exposed areas; may be seen in its early stages as erythema with telangiectasias |
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| The classic nodular form of this often presents with telangiectatic, pearl-like elevated and rolled borders with a central rodent-ulcer appearance |
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| a focal loss of epidermis and dermis that heals with scarring |
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| Frequently mistaken for a spider bite; is an uncommon, painful, ulcerative, cutaneous condition of uncertain etiology. Since surgical excision is not curative and the condition does not respond to antibiotic therapy, patients should be referred to a wound-care specialist |
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