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Hi there kindly answer following questions for further advice:
Age? Male or female?
Past medical history?
Any medicines using?
Smoking and alcohol?
Upload picture please
For how long is there and is it itchy?
It looks like an Erythrasma
It is caused by bacterial infection. So best would be to make an appointment with GP to have a physical examination and if needed test from skin swab/scrapings and antibiotics most probably once diagnosis confirmed