2 days ago a bluish/ purple bruise appeared on my top lip. It subsided a little on Sunday but is quite noticeable again today. I have no idea what has caused it. I have never had anything like it in my life before. I do have other health problems, asthma, urticaria, irritable bowel, and vertigo, but my doctor also recently done an h I v test on me as he noticed my white blood cell count has always been lower than average, but was even lower still when I last had blood taken.the test was negative. I don t think any my medication has caused it as have been on it for quite some time now . Do you have any idea why this has happened?