Young man...
Your scrotum is located in the sensitive 1% region of all humans.
Lesions that affect this area are not necessarily due to fungus and it appears this way in your case.
Would you perchance say there are a lot of stressors in your life?
Marital status & sexual history may be important here and to be discussed and assessed if linked.
Stress of any other nature also could focus on this area and become a chronic cycle so best to discuss it with a Dermatologist who understands you.
There is a condition called LSC scrotum that fits into your described symptoms.
Yes the sweat 💦 will be an aggravation and that needs to be addressed too.
Next Steps
If based in Bangalore, an in-person consultation may be useful; Alternatively an online consultation not so bad either.
Health Tips
Stop 🛑 all powders of any sort..
Avoid excessive washing of the area
gentle cleanser like Dove 🕊️ may help
Clip fingernails short and file them to avoid scrotal damage.
wear loose fitting 🩳.. not 🩲