Can't tell from here: A painless moveable mass under the skin there could be either, or it could be a sebaceous cyst or other non-cancerous growth/mass. No way to tell for sure without taking it out and sending it for a pathology report. Any new mass (bump, knot) on or under skin (or anywhere else) should be checked out by your doc. A mass that is not new but changing in size or symptoms should also be checked.
Answered 6/21/2015
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Sounds like cyst: This sounds more like a cyst than a lipoma. Lipomas are usually bigger and really soft. It is not necessarily a pilonidal cyst, it could be just a sebaceous cyst. Have your doctor look at it at your next appointment.
Answered 6/25/2015
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