Tour condition may be an inflamed retention cyst of the sebaceous gland in the skin. When the outgoing canal of a sebaceal gland is blocked, the sebum might not get out, and then the whole gland enlargens and turns into a cyst filled with sebum. If an infection occurs, the skin above the cyst will normally become red; the cyst will most likely fill up with puss and become painful. It has the ability to repeat itself until the cyst is removed surgically. You can visit your doctor for a physical examination and determine how you can proceed from there.