I found this site after a Right TKR on 7 August 2019. I was looking for any comment re a rash and spotted FitGal's entry where she says she developed one about 10 days after surgery. I have the same situation, a red lumpy rash just started up and the itch drives me crazy. GP says it is Grover disease, a heat rash and there's not much other than apply the Tricortone cream 3 times a day. There are some who say is could be an allergic reaction to the dressing, mine is a type of gauze with glue. Did Fitgal's disappear after the dressing fell away, I am 4 weeks post surgery and can walk and do most stuff but the itch is driving me to drink. I must admit I did have the blues at about 1 week post but things have improved. I reckon there is a lot of good advice on this forum.