Our expert says:
Apologies for the delay in responding. It sounds like it could be a fungal infection which can simply be due to the warmth and moisture in the groin area - particularly if you wear tight fitting trousers. However, I recommend that you check this out with a a doctor who can examine the patches. Try not to be embarassed, the penis is just another part of your body and not all skin infections in that area are sexually transmitted.
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