I had a Conformis Custom Knee replacement in July 2021. My recovery was normal, I think, except the fact that I had 2 small scabs on my incision that never quite healed. They "almost" healed, then got worse, then other parts of the incision started to open again and I had a horrible rash all over my entire body...especially on my lips--this was 3 months PO . I saw a dermatologist who gave me prednisone, antibiotics and an antiviral. He also set up allergy testing--skin patch. Scab healed and all was well...until it wasn't. Scabs reappeared and I got the rash back. Finally got the results of the allergy testing and it turns out I am allergic to nickel...which my implant contains a very small amount of. I have my 2nd knee scheduled in 1.5 months, so I am sure that is going to be quickly canceled--just got my results yesterday. I guess what is puzzling to me right now is the fact that I have absolutely no pain in my replaced knee--I just got home from a 1 hour walk. From other posts I have read re: metal allergies it seems like the most common symptom/issue is pain in the joint. Is there anyone out there with a similar issue? Dermatologist says best case scenario is that I occasionally have to deal with a rash. I can live with that, although I am not certain that will be the case.