Could be fungal infection. Show a Dermatologist and take proper treatment.

Hi. Greetings. You may be having scabies or fungal infection or both. Fungal infection is quite common, especially more common in men. This is often related to humidity, tight clothing, excess sweating and accumulation of moisture. You'll need to keep the area dry, wear lose clothing. You'll need to see a qualified dermatologist for confirmation of infection and treatment with oral antifungals and creams. If there's resistance to one particular medicine another medicine may be needed depending on your improvement. DO NOT USE OVER THE COUNTER CREAMS LIKE BETNOVATE GM OR PAN DERM OR QUADRIDERM... this will only prolong the infection. you could send in further queries/pics of the lesions on follow up messaging. Hope this helps.