Accidental?: At your age, a small bruise may simply be accidental. However, if you begin to notice more unexplained bruises, you will need to see your dr to get a "blood coagulation profile" which may explain the bruises ( low platelet count, reduced or absent clotting factors, blood vessel wall issues etc). The so called "allergic purpura" refers to bruising due to allegic injury to small skin capillaries .
Answered 11/21/2020
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