I have had a very uncomfortable 'zit' on my back for several months now. It comes and goes but it is directly on my spine and hurts horribly when it is infected.
An epidermal cyst is a firm, slow-growing lump underneath the skin. This cyst contains soft, cheesy-like skin secretions. These usually appear on the scalp, face, neck, chest, upper back, genitals, or behind the ears.
