I saw your post earlier but could not respond until now- FYI, I agree with the other posts above as to probable cause, the severity & the need to see a vet a.s.a.p. I wish you & your snake all the best- let us know how it goes?
I've seen the "thin skin" issue in a snake I've rescued in the past due to chronic malnourishment. When a snake is in this condition, they may always have easily torn skin from then on, even after their nutrition has improved; they become "special needs" pets even after their skin heals over.When a snake is starving, the skin is not as important to survival as their main bodily organs, so what nourishment there is never reaches the skin- sadly the damage can be permanent.