Foreskin of penis swelling?

I just master bated about an hour ago and I noticed that my penis is starting to swell I'm 13 and this has happened before but it swelled badly and i went to the doctor and got medicine for it. the foreskin is covering the head almost to the tip and its scaring me I looked on google and most people said I will... show more I just master bated about an hour ago and I noticed that my penis is starting to swell I'm 13 and this has happened before but it swelled badly and i went to the doctor and got medicine for it. the foreskin is covering the head almost to the tip and its scaring me I looked on google and most people said I will go away in a day or two but I'm still scared. Some one help me
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