Skin reaction: Sounds like these are some type of local irritation which could have several causes. It is possible to get these types of lesions just from the rubbing and physical trauma to the skin. In this case, extra water based lubricant would be the answer, and don't be as rough with yourself. If you are using lubricants, this could also be the cause - some of them have additives/chemicals that could cause.
Answered 12/21/2015
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