Pilonidal cyst: An abscess that occurs in the cleft between the buttocks at the base of the tailbone (coccyx). Pilonidal cysts are common in adolescence, often after long trips that involve sitting. SLIDESHOW Rosacea, Acne, Shingles, Covid-19 Rashes: Common Adult Skin Diseases See Slideshow From Skin Problems and Treatments Resources What You Should Know About PsoriasisIs Your Skin Trouble Blocked Hair Follicles?Is It Dry Skin Or Atopic Dermatitis? Featured Centers What Are the Best PsA Treatments for You?Understanding Biologics 10 Things People With Depression Wish You Knew Health Solutions From Our Sponsors Shot-Free MS Treatment Your Child and COVID-19
