I've been noticing very dark (some almost black in color) bruises on my body with no injury. The most serious are on the back of my thigh above the knee and on my lower stomach. They aren't particularly painful just very large and dark. I haven't had any real health problems besides being overweight and having migraines. I did have surgery to remove a bump on the bone of my left pinky toe about two months ago but it has been healing fine. I also got bit by a dog about a month ago, causing a small cut on my finger. I didn't go to the doctor for it since it seemed to heal fine. Other than the bruises I can't think of anything major to go with it. I have felt tired and just generally kind of gross lately but I've been super busy so I don't know if that's the reason or what. What could these bruises be from?