Epidermoid cysts, also called sebaceous, keratin, or epithelial cysts, are small, hard lumps that develop under the skin. These cysts are common. They grow slowly. They do not cause other symptoms and are nearly never cancerous.
In the past, pilar and epidermoid cysts were wrongly known as ‘sebaceous’ cysts but this term should be used only for a quite different and much less common type of cyst that is filled with a clear oily liquid made by sebaceous (grease) glands. Epidermoid and pilar cysts are common, benign, and not contagious.
If it becomes swollen or tender, home treatments may help. Putting a warm moist compress over the cyst may help it drain, for instance. Resist any temptation to pop or squeeze the cyst, like a pimple. But if it’s inflamed and causing discomfort, you should see a doctor.
Wart on foot after it was frozen with liquid nitrogen by the dermatologist. This video was filmed at home and not at the dermatologist’s office.
Distinguish between a sebaceous cyst and epidermoid cyst. An epidermoid cyst is more common than a sebaceous cyst. Each will have slightly different symptoms and will be treated just a little differently. Therefore, it is important that the cyst you have on your skin is diagnosed appropriately for effective treatment.
Both types of cysts are flesh-colored or white-yellow and have a smooth surface.
Epidermoid cysts are more common. These are slow growing and often painless. They don’t usually require treatment, unless they are causing pain or become infected.
Pilar cysts are composed primarily of keratin (the protein that makes up hair and nails) and form from the outer hair root sheath, typically on the head. A pilar cyst is often thought to be another term for a sebaceous cysts, but they are in fact different.
Sebaceous cysts are commonly found in the hair follicles on the head. They form inside the glands that secrete sebum, an oily substance that coats the hair. When these normal secretions are trapped, they develop into a pouch containing a cheese-like substance. They are commonly found in areas near the neck, upper back, and on the scalp. Sebaceous cysts are often confused with pilar or epidermoid cysts.
Distinguish between cysts in the breast and tumors. Cysts can be in one or both breasts. Without a mammogram or needle biopsy it is almost impossible to distinguish between the two different types of lumps in the breast. Symptoms of a breast cyst will include:
- Smooth, easily movable lump with distinct edges
- Pain or tenderness over the lump
- Size and tenderness will increase just before your period starts
- Size and tenderness will decrease when your period ends
Understand cystic acne. Acne is a general term that describes a variety of different types of pimples, blackheads, pustules, whiteheads and cysts. Cystic acne are nodules that are red, raised, often 2–4 mm in size and nodular and are the most severe form of acne. The infection in a cystic acne is deeper than that in other pustules or whiteheads. Cystic acne is painful.
Identify a ganglion cyst. These are the most common types of lumps found on the hand and wrist. They are not cancerous and often harmless. Filled with fluid, they can quickly appear, disappear or change in size. They do not require treatment unless they interfere with function or are unacceptable in appearance.
Determine if pain is from a pilonidal cyst. In this condition there is a cyst, abscess or dimple that forms in the crease between the buttocks that runs from the lower end of the spine to the anus. It can be caused from wearing tight clothing, excess body hair, sitting for long periods of time or obesity. Symptoms can include pus from the area, tenderness over the cyst, or the skin may be warm, tender or swollen near the tailbone. Or there may not be any symptoms beside a pit or dimple at the base of the spine.