<s>[INST] My wife fell backwards and hit the back of her head a week age. She has a very dark bruise across the back of her head now. It goes from ear to ear. She s on blood thinners. We went to the er and they did a cat scan, everything was okay. But, I concerned about this ugly bruise, [/INST] hello, non bleeding bruise, on blood thinners, ct scan- normal. good prognostic indicators. have a course of antibiotics with antibiotic cream with not allowing water to get infect helps in early healing. in my opinion already her treating doctor might have started antibiotics. all d best, take care. </s>