Hello,
It sounds like the redness and blotches are caused by friction rub due to masturbation or due to chaffing with clothes.
Wash the areas several times with fresh water. Do not use any cosmetic products at the sites. You can apply some calamine lotion at the rash as it will help in soothing the skin.Also wear cotton undergarments and use lubrication while masturbating.Application of mild corticosteroid cream and oral antiinflammatories like ibuprofen/acetaminophen are also helpful.If the symptoms are severe then it will be best to consult a dermatologist
I hope that helps. Take care and pls do keep me posted on how you are doing or if you have any additional doubts. Kind regards.
Thanks but it almost seems like its under the skin, after masturbaiting it gets red and white blotches.