Irritation: from the bra hooks could be the cause, at your young age, but a local infection is also a possibility. Assuming you have had no injury, you could try wearing a sports bra, keeping a little disposable hand warmer (from sporting/hunting store) on the spot and watch it for several days. If redness or pain get worse, or you get a fever or chills, be seen right away. Good luck!
Answered 8/21/2016
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