Cyst or abscess: This sounds like an inflamed cyst or an abscess. A cyst is a plugged hair follicle that gets filled with keratin (dead skin) debris. This can enlarge and become inflamed/infected. An abscess is a collection of pus, usually from an infection. They commonly occur in areas of friction (like the groin). I recommend evaluation by a dermatologist in case you require drainage or antibiotics.
Answered 3/22/2018
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