Suggest Treatment For Skin Rashes In Genital Area

I have skin rashes at my sexual area.No itching , no pain but the skin there is dry, like old man's skin. It increases when I eat pickles, curries with heavy masala, tamarind etc. and when get wet by sweat and or water. I have tried homeopathy , ayurvedha, english medicines but no use please solve my problem
Mr th
kerala