Hello,
From the symptoms, it can be due to balanitis caused by fungal infection, vitiligo skin or lichen sclerosus. I would suggest you to get an evaluation done from a dermatologist as treatment is specific for all.
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 dermatologist. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.