Hi,
This could be due to some bacterial infection/ fungal infection or dermatitis or eczema, etc.
Nothing can be said with surety without having a look at the lesions.
It would be best to consult a doctor about the symptoms if they do not resolve and get a proper clinical examination.
Keep the area clean and wear clothes washed in a few drops of chlorhexidine preferably and dried in the sun.Maintain good personal hygiene and wear lose comfortable clothes. Apply calamine lotion at the sites ,and take oral antihistamine medications like loratadine or cetrizine for the itching. You could apply some over the counter antifungal cream like clotrimazole and use some powder to keep the area dry.
Let us know about what your doctor advises and how you are doing.
Regards.
ill tell you what really works!!
alovera! you can grow it in plant form or buy it from the chemist or health shops, its all natural and clears it right up, i had this problem after i had my first daughter used everything spent loads of $$ on anti fungla creams and alovera was the only thing that worked! good luck!