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Allopecia - Differential Diagnosis Framework for Hair Loss

Localized / Focal Hair Loss Pattern:
 • Scarring Alopecia:
Localized / Focal ... Traction alopecia Diffuse ... Scaling, pustules, crusts ... at bald spots associated ... weight loss • Chronic
Nonscarring Alopecias: Clinical features of the most common types
Patterned hair loss:
 - Age: puberty or older
the most common types ... patches; rarely diffuse ... Tinea capitis ... area of scalp; focal ... hair - Can be associated