I have a bruise that appeared on the left side if my mid abdomen. It started small, a slightly blue discoloration. In the past five days it has gotten bigger and darker and now has purple dots. And is tender. I have diabetes, under active thyroid, and sarcoidosis (and small vessel vasculitis as a symptom of the sarcoidosis). What could cause such a bruise? I did not hurt myself or get bitten. The bruise is growing and worsening. Thanks!