Thanks for posting your query at DoctorSpring.com
I understand your concern.
This seems to be like a fungal infection in the pic. It's called tinea. There also seems to be some kind of allergic component.
I would recommend that you apply clotrimazole cream and cortisone cream twice a day for a week and see if it helps.
In case it doesn't subside, then it would be best to visit your doctor.
Please let me know if you have any queries.