Hair Foundation
HAIR DISEASE » Hair Injury (Scarring Alopecia)
Folliculitis Decalvans

Areas of scalp inflammation also exhibit boggy patches with boil-like pustules and scabby crusts. Moist areas may be infected with skin bacteria, but whether the infection is cause or effect is not known. Immune system dysfunction is also suspected as a cause.

From article:
Hair Loss and Its Causes