Hello, Thank you for posting on HCM. Thr contion you have described is difficult to diagnose without proper clinical examination but from badic description i would suggest two differential diagnosis. Firstly, it could be simple ringworm/ fungal infection and secondly it could be erythrasma( bacterial infection). Ideally your dermatologist would prescribe a course of oral drugs and creams for local application depending on whether it is fungal or bacterial. Apart from these you should apply some dusting powder to absorb excess sweat and prevent growth of microbes. Maintain proper hygiene of these areas. hope this will take carw of your queries. Thank you Dr Hardik Pitroda