Thanks for writing to us.
from the description, it sounds like fungal infection
only. To treat the same you may apply a steroid antifungal cream or mix hydrocortisone
in equal quantities and apply. Also take tablet cetirizine for few days to alleviate itching.
Once the lesions have completely subsided, dust the area with antifungal dusting powder to prevent further infection. If the lesion do not resolve, you may need a course of oral antifungal
Hope that answered your query.