An epidermal cyst is a type of slow-growing lump underneath the
skin. This cyst contains soft, cheese-like skin contents. These
usually appear on the face, neck, chest, upper back, genitals,
or behind the ears. Similar cysts called pilar cysts often occur
on the scalp. - Blockage of a hair follicle by skin cells—When
an injury to the skin occurs, cells from the surface may block
hair follicles located deeper within the skin. - Damage to a
hair follicle due to acne - Blockage or defect of the sebaceous
gland—This gland is near the hair follicle. It secretes oily
material used to lubricate the skin and hair. If you have any of
these symptoms, do not assume it is due to a cyst. These
symptoms may be caused by other conditions. Tell your doctor if
you have any of these: - Small, dome-shaped lump beneath the
skin - Foul-smelling, cheese-like material draining from the
cyst - Redness or tenderness on or around the cyst if it becomes
inflamed Your doctor will ask about your symptoms and medical
history. A physical e