Our expert says:
If you have never had sex or any skin on skin contact then it is not likely to be an STI, no. That part of the body is warm and may be moist if you wear clothing that doesn't allow for air flow so it could be a skin condition related to this. It could be relatively easily remedied, so just speak to your GP to let him/her identify what it is so that you can get the correct preparation for it.
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