What is a blood blister?

A blood blister is a small, raised pocket of fluid that forms underneath the top layers of the skin. Unlike regular blisters filled with clear fluid, blood blisters are characterized by the presence of blood in the blister. This occurs when small blood vessels near the surface of the skin rupture, causing blood to collect in the blister. Blood blisters can vary in size, ranging from a small dot to a larger, more noticeable bump. They are often painful and can occur anywhere on the body.

Causes of blood blisters

Blood blisters can be caused by a variety of factors. One common cause is repetitive friction or pressure on the skin.