You may be suffering from tinea cruris which is fungal infection of the inner thighs, groin and buttocks area. It is also called jock itch. It can be treated by taking four to six weeks of anti fungal treatment which includes tablets along with creams. Do not use soap over that area. Mistreatment with over the counter Steroid containing creams like fourderm, panderm, quadriderm, dermi5, betnovate, dermikem OC, candid b etc lead to repeated case of recurrence and also side effects due to application. Do not use steroid containing combination creams. Please contact me using online consult option with photos for detailed prescription. Do not delay treatment as it may spread further on your body and also to other people living in the household. 

Lifestyle changes shall help in long term control as medicine treats it . Preventing is in your hands

Hi. Antifungal medications do not cause weight gain. Kindly let me know the details of medications you have taken and photos of the affected areas, with duration of treatment taken. Will help you out with the same. Hope this helps. Warm regards.Dr Govind S Mittal, Therapeia Skin Hair and ENT Centre, Bengaluru, #bengalurudermatologist.