Small red blotches on groin

Patient: I have small round red blotches on my groin which occasionally itch. The skin on the blotch can be quite dry. I am not sure as to what it is and the cause. I am living in Korea and it starting to get humid and sweaty, but I am also worried it could be some sort of STD.

Symptoms: Itching, red blotches.

Doctor:

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