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Can you attach the photos here? How old are you? Female or male? How tall are you? How much do you weigh? Any medical problems? Any surgeries? Any medications including over-the-counter pills and herbs? Any family medical history?
Okay. I am waiting for the photo. Are you aware of anything which might have triggered it?
Okay. waiting for it.
It looks painful. You should apply Neosporin there and put band aids. Put thick gauze under bike shorts so that the lesion is not irritated when you ride a bike.