Hello Doctor, My son is 14 months old. Until yesterday he's fine suddenly yesterday night he started rubbing under his neck front side, I thought he's getting sleep so he's rubbing ( if he needs to sleep he rubs his ears most of the times). But next day morning when I saw his back side of neck it's rough some what and colour changed to some what darker and skin got some wrinkle. Even same for the under neck but colour not changed and not noticeable until we touch it. So the thing is it's all around the neck.  (Please check the attached pic.) Don't know what happened? Every time we check all the things before using to baby. Please suggest.