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Allopecia - Differential Diagnosis Framework for Hair Loss

Localized / Focal Hair Loss Pattern:
 • Scarring Alopecia:
/ Focal Hair Loss ... Disease: Discoid lupus ... Diffuse Hair ... hair loss ... #Hair #loss
Hair Loss (Alopecia) - General (Diffuse and Focal) Differential Diagnosis Algorithm

DIFFUSE
Scarring - Irreversible-biopsy required
 • Lupus
Hair Loss (Alopecia ... Irreversible-biopsy required • Lupus ... Infectious • Tinea ... • Discoid lupus ... Shafts • Tinea
Nonscarring Alopecias: Clinical features of the most common types
Patterned hair loss:
 - Age: puberty or older
the most common types ... loss: - Age: puberty ... patches; rarely diffuse ... in 5% of cases Tinea ... area of scalp; focal