Epidermoid Cysts
Epidermoid cysts, also called sebaceous cysts, are benign (non-cancerous) skin cysts formed from blocked oil glands in the skin. Most commonly, epidermoid cysts are found on the genitals, trunk and back; but, they also can occur in other areas of the skin.
What Are the Symptoms of Epidermoid Cysts?
In general, epidermoid cysts have a round appearance. A dark portion of the cyst is visible on the skin. If the cysts become infected, they will become red and tender. When the cysts are squeezed, they can produce a cheesy white discharge.
How Are Epidermoid Cysts Treated?
The effective treatment of epidermoid cysts requires that the sac of the cyst be completely removed. If the cyst is squeezed and the discharge is forced out, the cyst will reappear in the skin. Usually, a doctor will be able to remove the cyst by making only a small incision in the skin. Antibiotics may be prescribed to treat infected cysts.
(courtesy of WebMD)
My husband has something similar on his back at the base of the neck. He says it doesn't hurt but I keep squeezing on it and I get cottage cheese like pus out of it. And I mean there's a lot of it too. Not to mention it stinks. I thinks its an incysted oil gland. Other than that, I have no clue what it is or what to do about it.