It is, of course, impossible to make a specific diagnosis over the Internet.
Your description sounds consistent with that of an epidermal inclusion cyst, also known as a sebaceous cyst. These cysts can slowly enlarge, and they typically have a small black spot near the center of the cyst. They can become inflamed and infected at times, which can be quite painful. If they are symptomatic, then they can be surgically removed. I must remind you, however, that I cannot tell you if you have this problem, or if it is another problem, though, because it is impossible for a physician to make a diagnosis over the Internet.
Sincerely/ Robert A. Wascher, MD, FACS
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