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Has he had a CT or a pet scan? Those tests are generally more accurate than xrays for detection of cancer cells. Are you dealing with his oncologist, PCP, or other doc on the side pain? Surely one of them can address this with you. Just keep asking until you get answers. We have to be our own biggest advocates and sometimes that means asking the same question again and again.
I've had 4 types of immunotherapy for melanoma treatment but have never had a rash. Some of my melahomies have had them, though.
Check out this search results page of a melanoma site I'm on. There's lots of posts on immunotherapy and rashes and some possible good ideas.
Yesterday I went in for my blood work, the white count was coming up but my red count was low and they gave me an injection of procrit. They also gave me fluids for the low BP. Got to talk to my doctor for a few minutes in between her scheduled patients and talked to her about the BP. She told me to try eating some foods high in salt content that the salt will bring up my pressure faster then the water I am drinking and to eat some fruits, like watermelon, and veges, like cuke's, that have a high water content. Still was not feeling good when I got home but just pretty much slept off and on now stressing over the red blood cells and the possibility of needing a blood transfusion if the procrit does not do what it is suppose to do. Hope every one is having a good day today!!!