It is, of course, impossible to make a specific diagnosis over the Internet. Fortunately, most lumps and bumps in the area that you describe (especially in young people)are benign, and include abscesses (pockets of infection underneath the skin) or pilonidal cysts and sinuses(pockets under the skin which communicate with the skin surface through tiny little tunnels, or sinuses, and which often contain ingrown hairs).
You should see your physician for an examination, and for any treastment that might be required.
Sincerely/ Robert A. Wascher, MD, FACS
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