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Can you attach the photos here? How old are you? How tall are you? How much do you weigh? Any medical problems? Any medications? Any symptoms such as pain or itch? When did it start? Is it getting worse? Are you aware of anything which might have triggered it? Any other symptoms such as urtheral discharge?
It could be bacteria infection of the skin. You should see your doctor to have antibiotics and pain medications.
You are welcome. Take care.