It's Fungus or yeast infection....common around skin folds like thighs and genitals.. avoid sweating, sharing clothes,towels and soap.. specific medicine required depends on the severity.. for detailed prescription do direct online consultation by sending photos.

Are you overweight! Applying some deos, perfumes!  Are there any visible itchy lesions etc. Many questions need to be addressed before coming to conclusion. Consult with images in detail.

Consult online for further treatment

No need to worry.specific treatment is available.it depends on severity of the disease . Complete medical history is required.. Pls do online consultation with Dermatologist for detailed prescription & guidance.

Some hyperpigmentation is common over these areas in the body. But thickening alongwith darkening of skin could also be caused by genetic factors, hormonal changes, infection or friction. More details are required to advise in detail. You should wear soft, non irritating clothes and take measures to reduce moisture in the area by using anti perspirants

I understood your concern  and noted the problem as well .I need to ask few more details to make a diagnosis and start treatment and advice which suits you. Pl consult me on Practo , so that I can help you better.book a time slot as per your convenience for consultation.

Take consultantion and discuss in detail