16 Disturbing Things Your Nails Reveal About Your Health

9. Red Streaks

Small red or brown streaks under the nails are usually damaged blood vessels, most likely resulting from trauma to the nail. If more than one nail is affected without an obvious cause, such as an injury, it could be a sign of lupus, endocarditis, or psoriasis.

Dark stripes affecting all the nails are common in people of color and aren’t usually a cause for concern. A dark stripe under just one nail, especially one that grows larger or affects the surrounding skin, could be a sign of skin cancer and should be assessed by a doctor.