Hello and welcome to HCM, I read your query and understood your concern. Unexplained/ mysterious bruising can be due to a various of reasons, most commonly blood disorders, long standing diabetes or nutritional deficiency. Consult a physician and get complete blood work up done for thrombocytopenia (decrease in platelets) and clotting factor s deficiency. Get Blood sugar tested to rule out diabetes. Sometimes nutritional deficiencies, which may cause unexplained bruises. Supplement your diet with vitamin C, B complex, vitamin K and minerals tablets. Once the cause is determined the treatment proceeds as per the underlying cause. I hope I was able to answer your query