A 77-year-old Caucasian man presents with an epidermoid cyst on his scalp, in the left parietal area. He tells you he has had the cyst for many years and it always seemed to remain the same. He is ...

Skin cyst is a sac like lesion situated beneath the skin which is filled with fluid or pus and other secretions, and enclosed by a cyst wall. The skin is made up of 2 layers, an outer layer called the ...