An Up-to-Date Approach to the Management of Dissecting Cellulitis.

Dissecting cellulitis of the scalp (DCS) also known as perifolliculitis capitis abscedens et suffodiens (PCAS) is a chronic, relapsing, inflammatory dermatosis consisting of edematous sterile pustules and nodules resulting in sinus tracts and scarring alopecia. Although first described as infectious in 1903, DCS is primarily an inflammatory process that can precede a secondary infection; this is similarly true of the other conditions within the follicular occlusion tetrad: hidradenitis suppurativa (HS), acne conglobata, and pilonidal sinus.