L70: Acne

L70.2: Acne varioliformis

Every hair is anchored in a small bulb, the hair follicle. Sebaceous glands are usually attached to these hair follicles. The sebaceous glands produce an oily substance for the skin called sebum. Sebum prevents the skin from drying out.

Pores in certain places in your body are persistently inflamed. This skin condition may be caused by pathogens. The skin can form small blisters and scars in the affected places. Those skin areas are sometimes itchy, too. The scalp and the skin on the neck, in particular, are usually affected.