Hands changing skin and nails?

My hands have change over night. I have POLYMYOSITIS.  I have been on Prednisone 5mg  for over 20 yrs.  My hands have a weird feeling in my finger tips.  They feel very smooth but they look like have  been in the water too long. Around my nails are getting very hard. The skin is like stone almost all  around nails now. I use lotion every day I also get a manicure every 2 wks   Even the woman who has been doing my nails for yrs said not hangnails  just hard skin. I have thin skin from prednisone on my hands and arms but I have this wrinkle look to the fingers which is new  Anyone else???