Kindly do see a skin specialist. The area is prone to rashes and infection. Specially ones with fungal element. You shd get it treated as soon as possible
It cd range from tinea infections to viral infections. The best option is to see a dermatologist closed to u
Next Steps
Start your treatment , as it can worsen and spread
Health Tips
Loose clothing Throw away your old undergarments and wash the new ones in hot water