Hi and welcome
could be a bacterial or fungal or combined infection. You needs to be investigated for that. Apply antibacterial creams to the part and keep the part in hygienic condition. If it improves than continue with that else needs to consult your doctor and get proper oral medication and tropical steroids
for local application. Certain steps to prevent the disease are:
always use a clean washcloth and towel each time.
1. Do not share towels, clothing, razors, and other personal care products with other family members.
2. Wash your hands thoroughly after touching the skin lesions.
3. Good general health and hygiene help to prevent infection.