Folliculitis is a condition characterized by inflammation or infection of one or more hair follicles. It can be caused by bacterial, fungal, or viral infections and can also result from irritation due to tight clothing or shaving. Symptoms may include redness, itching, and small pimples around the affected hair follicles. Treatment depends on the cause of the condition but may involve antibiotics for bacterial infections, topical medications for fungal infections, or simply avoiding irritation from tight clothing or shaving until the inflammation subsides.