I have a pimple on my head. I have had hair on it for several years. Now it seems a little big.

Hello; According to your situation, this may be due to the condition of local sebaceous glands in the skin, or it may be due to the condition of local lipoma, local skin bulge, accompanied by local compression.

Suggestion:

Avoid excessive stimulation of local skin at ordinary times, keep local skin clean, and at the same time, surgical treatment can be chosen when local mass increases. Send for pathological examination after operation.