Skin infection?: Probably an infected hair or infected insect bite. Apply warm compresses and antibiotic ointment such as Bacitracin for a couple of days. If it gets bigger or does not seem to be healing, see a doctor and have it checked. Good luck!
Answered 3/19/2017
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The only: way to know is to see a doctor, examining the lesion is the most important part of diagnosis but if I want to take a guess I would say you have an infected Pilonidal cyst which is a pile of ingrown hair.
Answered 8/2/2014
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