Nikki A. Levin, MD, PhD, is an Assistant Professor of Medicine, Division of Dermatology, University of Massachusetts Medical School, Worcester, MA. Note: The author reported no actual or potential ...

Bacterial folliculitis is a relatively common infection of the hair follicles. It is usually caused when follicles are blocked by ingrown hairs, oils, or skin care products, trapping bacteria in pores ...

Yeast infections on the scalp are caused by an overgrowth of fungal organisms. Malassezia, a yeast that often causes dandruff, seborrheic dermatitis, and folliculitis (inflamed follicles), is the most ...