Home News If You Have This Dark Red Blister on Your Finger or Foot, Here’s What You Should Know

If You Have This Dark Red Blister on Your Finger or Foot, Here’s What You Should Know

News admin1 · February 17, 2026 · Comments off

A blood blister forms when shearing force or pressure damages tiny blood vessels (capillaries) in the dermis (the layer beneath the outer skin), but the epidermis remains intact. For illustrative purposes only Here’s what happens step by step: Pressure or trauma compresses the skin against bone or a hard surface Capillaries rupture, leaking blood The blood becomes trapped beneath intact skin The body isolates the blood, forming a protective pocket Because blood is thicker and darker than clear blister fluid (serum), the blister appears deep red, purple, or black rather than clear. Blood Blister vs. Regular Blister vs. Bruise Understanding... Continues…