Follicultis decalvans

Folliculitis decalvans is a slowly spreading inflammation of the hair follicle, which leads to progressive scarring. It is distinguished by follicular plugging and multiple rounded or oval patches can be found on the scalp, each surrounded by crops of follicular pustules. There may be no other changes, but successive crops of pustules, each followed by the destruction of the affected follicles, produce the slow extension of the alopecia. The exact cause of this condition is still uncertain, but is most likely an abnormal 'host response' to various common bacteria.