A young friend of mine recently completed chemo and then radiation for hodgkins lymphoma . He now has what appears to look like a series of stretch mark looking marks on his back. His is a tall, very skinny 18 year old. Any ideas as what may have caused them. His oncologist asked if he had a girlfriend..... he does not.
The stretch marks can be because of loss of weight which he must have suffered during the disease and treatment. Or the radiation must have made the skin Chat Doctor.  Wait for some time and things should be fine. Regards.