Thanks for writing to us.
As I have not personally examined you ,I can only presume probabilities or Differential Diagnosis.
due to UV rays/Sun tan.
As the name suggests that you are an Indian, are brown skinned. brown skin tans on exposed parts of the body to sun and therefore on covering the exposed parts to sun screening creams which protect the skin from UV rays, the original complexion returns.
2) Hypermelanosis also responds to Vitamin C
500 to 1000 mg per day
3) Very high Insulin levels as in Insulin resistance
/obesity /occult malignancy leads to a condition called Acanthsis Nigricans which leads to thick hyper pigmented velvetty skin. On removal of the causative factor , the skin returns to normal .
Kindly consult a dermatologist
for a prescription medicine. A Skin biopsy
establishes definitive diagnosis.
Wishing you a quick recovery,
Dr Lt Cdr ASN Bhushan.