My mum has just had an operation where she has her bladder removed. They attempted to put a needle in her arm which they couldn't. Now a few days later she this mark on her arm which is kind of like a burn however its growing and its becoming red, white, purple. The hospital have taken photos of this and sent up specialist to see this, however the do not know what this is and another specialist is coming to see her today. It seems to be growing and her arm is swollen and is causing her pain, any ideas on what this could be? I do have pics of it.