Term
| What are the three phases of the hair growth cycle? |
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Definition
Anagen - Growth phase
(lasts 3-7 yrs, 90% of hairs at any one time)
Catagen - Involution phase
(last 2 weeks, less than 1% of hairs)
Telogen - Resting phase
(lasts 3 months, 10% of hairs) |
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Term
| List the causes of DIFFUSE hair loss |
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Definition
PITTA DD
Protein deficiency
Iron deficiency
Telogen effluvium
Thyroid disease
Androgenic alopecia
Diffuse alopecia areata
Drugs - warfarin, antithyroid, retinoids |
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Term
Fact:
At Puberty Velus Hair acts under the influence of androgen to become Terminal Hair.
In Androgenetic Alopecia, Terminal hair returns to a Velus-like state |
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Definition
In women, male pattern baldness may be linked with androgen excess.
In males, their is conflicting evidence regarding this link. |
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Term
| What investigations are useful in the assessment of diffuse hair loss? |
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Definition
FBC, ferritin, serum iron, U+E, LFT, thyroid function
Microscopy of hair |
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Term
| Causes of Patchy Hair Loss |
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Definition
"TARTS"
Traction Alopecia
Alopecia areata
Ringworm
Trichotillomania
Syphillis (secondary) |
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Term
Fungal scalp infection
What are the common organisms implicated?
Do they fluoresce under Wood's light? |
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Definition
T. Tonsurans - No fluorescence
M. Canis - Fluoresces |
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Term
Alopecia.
In what type can "exclamation point" hairs be seen on microscopy of residual border hairs? |
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Definition
Alopecia areata
Note: Poor prognosis if occurs pre-puberty or in an atopic patient |
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Term
True or false
Alopecia totalis is the loss of all body hair |
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Definition
False.
Alopecia universalis is the loss of all body hair |
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Term
| Suggest treatments for Alopecia Areata |
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Definition
- Reassure: 3-6/12 then hair regrows spontaneously (back to original colour after 6-8/52)
- Topical or Intralesional steroids
- Topical calcineurin inhibitors eg. Tacrolimus
- Skin sensitisers i.e. diphencyprone
- PUVA
- Topical minoxidil
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Term
What are the causes of scarring alopecia?
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Definition
• Lichen Planus
• Discoid Lupus
• Sarcoidosis
• Pseudopelade
• Folliculitis Decalvans
• Post traumatic- Burns, radiotherapy, kerion
• Tumour- BCC, SCC |
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Term
| On examination, scalp follicular plugs may be seen in which condition causing scarring alopecia? |
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Definition
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Term
SLE.
What hair abnormality does this condition usually cause?
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Definition
| Diffuse Hair Loss, but may occasionally cause scarring alopecia |
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Term
What is defined as follows:
A slowly progressive scarring alopecia with no signs of preceding folliculitis or inflammation. Footprints in the sand (depressions of dermal atrophy) |
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Definition
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Term
Fact: Hair loss may be “diffuse” or “focal” (patchy), “Scarring” or “Non-scarring”
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Definition
Fact: Hair loss may be “diffuse” or “focal” (patchy), “Scarring” or “Non-scarring”
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