If an internal disease is found, whether it's kidney disease
, iron deficiency or a thyroid problem, treating that disease
often relieves the itch. Lastly, Phototherapy can also be tried.
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.