It is, of course, impossible to provide a specific diagnosis to patients over the Internet.
In view of your age, the lump you describe may be a pilonidal cyst. Most of the time, these cysts are relatively asymptomatic. However, they can become infected.
You should see your personal physician to have this lump evaluated, and to confirm the diagnosis.
Sincerely/ Robert A. Wascher, MD, FACS
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