Subungual hematoma: Images, treatment, and link to melanoma
Last reviewed Thu 17 May 2018
By Jennifer Berry
Reviewed by Judith Marcin, MD
A finger slammed in a door, a thumb hit with a hammer, a brick dropped on a toe — these nail injuries are common and extremely painful. They can cause blood to pool visibly under a nail, which is called a subungual hematoma.
A subungual hematoma occurs when an injury breaks open blood vessels under the nail, causing blood to collect and become trapped in one spot.
https://www.medicalnewstoday.com/articles/321836.php
