Hello,
Well without examination,confirmation of a diagnosis is tough nut various possibilities are there
for your symptoms.It can be
eczema,contact dermatitis,allergic dermatitis,fungal infection or sebrrheic dermatitis.
Wash the areas several times with fresh water and thoroughly dry it by patting nor rubbing Do not use any cosmetic products at the sites. You can apply some calamine lotion at the rash as it will help in soothing the skin.