It can be due to contagious diseases like a fungal infection. I suggest you to get a KOH examination of the skin scrapings done to confirm the diagnosis. If fungal infection is confirmed you may need topical and oral antifungals.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
i consulted a skin specialist, he said, it is due to deficiency in balanced diet and he gave me some tablets like vitamins etc.,. and he gave one ointment also. now i am under the treatment only, now its ok.
very much thank you for your kind reply sir.