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Alopecia
32/32
Non-scarring
Scarring / cicatricial
Shaft abnormality, fragile
Shaft abnormality, not fragile
No shaft abnormality
Lymphocytic
Neutrophilic
Mixed
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NO FILTER · 32 CANDIDATES · DON'T-MISS ALWAYS SHOWN
COMMON (7)
NON-SCARRING, NO SHAFT ABNORMALITY (6)
Alopecia areata
Patchy, round/oval; exclamation-point hairs; any age
Androgenetic alopecia
Vertex/bitemporal (M), diffuse (F); miniaturized hairs; onset in adolescence
Telogen effluvium
Diffuse thinning; positive pull test (>10% telogen); 6-16 wks post-trigger
Anagen effluvium
Profound, diffuse; pencil-point dystrophic hairs; 1-1.5 mo post-chemo
Traction alopecia
Marginal/peripheral; hairstyle-related; any age
Trichotillomania
Irregular, angular; broken hairs, varying lengths; childhood-adolescence
SCARRING / CICATRICIAL (1)
Acne keloidalis nuchae
Nape/occiput; Black males, 14-25; keloidal papules
DON'T MISS (10) - ALWAYS SHOWN
NON-SCARRING, FRAGILE HAIR SHAFT (1)
!
Pili torti
Flat twists, "spangled"; Menkes syndrome, Bjornstad syndrome; ATP7A, BCS1L
NON-SCARRING, NON-FRAGILE HAIR SHAFT (1)
!
Woolly hair
Tight, curly, corrugated; Naxos disease (cardiomyopathy); KRT25, KRT71, LPAR6, DSP
SCARRING / CICATRICIAL (6)
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Central centrifugal cicatricial alopecia
Vertex, centrifugal; Black females; PADI3 mutations
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Folliculitis decalvans
Scalp, scattered; adolescent males; tufted folliculitis
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Follicular mucinosis (alopecia mucinosa)
Face, scalp, neck; children (benign form); mucin in follicles
!
Lichen planopilaris
Scalp: perifollicular violaceous erythema with cicatricial alopecia; keratotic plugs, can affect any hair-bearing area
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Frontal fibrosing alopecia
Lichen planopilaris variant; older women, eyebrow loss
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Discoid lupus erythematosus
Erythema plus scaling plus follicular plugging plus scarring
INFECTIOUS (2)
!
Tinea capitis
One or multiple patches, may simulate alopecia areata; "black dots" are hair shafts broken off at the surface of the skin; kerion is a boggy, tender plaque with pustules and purulent discharge; cervical/occipital lymphadenopathy is highly predictive of positive fungal culture
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Secondary syphilis
Patchy "moth-eaten" non-scarring hair loss (7% of patients), with generalized maculopapular rash including palms/soles, condyloma lata, mucous patches
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