question: my dad is under chemo treatment for his stage IV lung cancer (diagnosed 2yrs ago) and he also has DVT in his left arm and currently taking coumadin and INR is at 3.2 (it's been 3 months). We noticed today that his neck on the side where dvt is is swollen and he has a red chest spot with no welts in the center middle chest. What's going on? Do we need to take him to the er?