Medically reviewed by William Truswell, MD Hair grows out of pores, small openings in the skin that secrete sweat and sebum ...

Discover the 6 types of ingrown hair cysts and evidence-based treatments that actually work. Learn how to identify your ...

Epidermoid cysts are most likely to develop around the ... Lipoma is another possible cause of lumps behind the ear. Lipomas are benign fatty lumps that can grow anywhere there are fat cells.