This is most probably
fungal infection. Fungus thrives on warm and moist skin like groin and under scrotum. Contributing factors are high humidity, heat, perspiration,
diabetes mellitus, obesity, friction from clothes. Fungal infection is contagious. Transmission occurs via infected towels, linens, and clothing.
Advice
1. Use cream containing
clotrimazole, steroid and antibiotic such as Lobate GM cream thrice daily locally
2.
Fluconazole 150 mg weekly by mouth for 2 months
3. Wear loose cotton undergarment
4. Avoid sharing clothing, towels, or bed sheets
5. Wash clothes and bed sheets in hot water
6. Do not scratch too much. It will cause
skin infection and black pigmentation of skin
7. Take high protein diet such as eggs and cheese to boost immunity
Thanks