Blood Under Skin On Arm

Bleeding into the skin can occur from broken blood vessels that form tiny red dots (called petechiae). Blood also can collect under the tissue in larger flat areas (called purpura), or in a very large bruised area (called an ecchymosis).

Purpura occurs when small blood vessels burst, causing blood to pool under the skin. This can create purple spots on the skin that range in size from small dots to large patches. Purpura spots are generally benign, but may indicate a more serious medical condition, such as a blood clotting disorder .

If you are taking prescription antibiotics or happen to be on oral contraceptives and spend long periods in the sun, that can also contribute to dark red blotches on arms. Skin conditions due to immune related disease like eczema and psoriasis can also be the trigger for unusual red marks on the skins surface.

If you have bleeding under the skin that is not the result of an apparent injury, it may be the sign of a serious medical condition or disease. Bleeding under the skin that is not caused by an injury can appear as small red or purple dots called petechiae, or in larger flat patches called purpura.

They are caused by a rupture of the blood vessels underneath the skin’s surface, usually cause by some form of trauma, such as pinching. Like all forms of blisters, blood blisters form on the upper layer of the skin.