Treatment Reaction after herceptin and perjeta

Best to have it checked out by your Doc but I did have a rash on my chest back in June (finished Herceptin in Jan) and saw my surgeon who thought it might have been Urticaria (hives) and it did go away with antihistamines. I now have another type of welty non itchy rash on my good boob which I showed my surgeon at my annual mammo last week and he said its nothing to worry about but of course I still am!!! Good luck, hope it goes away soon, and have a great time away !