I have been taking Enbrel, Arthrotec, Prednisone, Methotrexate, Coversyl, and Tiazac. I have RA and high blood pressure. Lately my skin has been sore. Like a I got a bad sun burn and if I use a towel to get dry it feels like I am running sandpaper over my skin. It happens on my face, legs and arms. There is no rash or redness. Could this be caused my the medications I am taking or RA itself?