Most likely it is a contusion, or bruise.
From Wikipedia: A bruise, also called a contusionor is sometimes referred by doctors as ecchymosis, is an injury to biological tissue[1] in which the capillaries are damaged, allowing blood to seep into the surrounding tissue.
Or you have leprosy.
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It means there was an reaction to an ink that was used, it could have been a different type of ink that was in your blood cells, but it doesn't mean your arm is infected or anything, but should still get it check out.
Green Blood Plasma is Usualy the result of taking certain medicine, especialy oral contraceptives