Over the past four weeks, I have had bruises appear, first on my upper left buttock. A week later, bruises appeared on my lower abdomen, between the area of the pelvic bones. I have one on my upper left thigh, and new ones are now beginning to appear on the right side of the middle of my back. I haven t been in any accidents or fallen (the only thing that has changed in my life recently is the adoption of two dogs). Could it be some kind of allergic reaction to something?