The skin behind ears going down around neck and front of neck feels like fine sandpapwr. 71 but never had pimples or skin problems, skin has always described as beautiful skin. However I did have two dental inplants 3 yrs ago and shortly after had a few pimples and then this rough startd behind ears and working it's way down around neck,looks normal but doesn't feel normal. Any ideas. ? I thought sensitive to metals in posts but no way of knowing.