@berhs
I have been on Prednisone for many years - and suddenly these purple bruises appear - as if by magic. They don't hurt - but look terrible. I have found that Arnica cream (no I don't have any affiliation with this company) is extremely helpful. I used to use DerMend (also has Arnica in it). It works well. The one I am currently using is Arnicare Bruise Cream (less expensive and works very quickly). It speeds up the healing. These are not "black and blue" from constant injuries. Nothing to do for the verry thin skin - but can look into collagen supplements which could be helpful.