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What is your age?
Please post a picture, if comfortable?
I am reviewing the pictures.
This is likely to be Pityriasis Versicolor which usually does not need treatment as it goes away on its own.
The other possibility is tinea versicolor which is a yeast infection. Probiotics, cotton undergarments, moisturizing the area, avoiding sweating would take care of it.
I hope your symptoms resolve soon.
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Itching point to Tinea versicolor. Sex is permitted and you may use an over-the-counter antifungal cream.