An epidermoid cyst is a benign cyst usually found on the skin. The cyst develops out of ectodermal tissue. Histologically, it is made of a thin layer of squamous epithelium. (WIKIPEDIA)
Is it dangerous?
No. Epidermoid cysts are harmless and are almost never linked with cancer. If you’re worried that it will grow into something more dangerous, check with your doctor to make sure it’s not another type of skin problem. (WEBMD)
Do I have to have it removed?
Not always. Sometimes, smaller epidermoid cysts go away on their own, or can be treated with warm compresses. Even if a cyst gets infected, a doctor (usually a dermatologist) can sometimes treat it by injecting it with steroids. But if a cyst bothers you for any reason, you can see a doctor to have it removed. (WEBMD)
You might be tempted to try to pop and drain an epidermoid cyst on your own, but this isn’t a good idea. First, if the cyst is infected, the infection could spread if the cyst ruptures and drains beneath the skin. Second, if any of the cyst’s sac is left behind, it could grow back. If the cyst doesn’t bother you, it’s fine to leave it alone. If it seems to be infected, is uncomfortable, or you don’t like the way it looks, it’s best to have it checked by a doctor. (WEBMD)