Why do i get random bruises ?

Bruising: Bruises are more common with age or deficiencies of vitamins b12, c, or k, or folic acid. Rare diseases that could have symptomatic bruising include lupus, cirrhosis, vasculitis. Some types of cancer, such as hodgkin's disease, leukemia, or multiple myeloma. If you are concerned about symptoms, please contact your physician.

Check CBC: It may be low platelet count or platelet dysfunction, medicatons, hormone, contraceptives and coagulopathies can contribute your primary care can intiate tests if necessary, or see hematologist.