Intense exercise can cause random bruising by straining a muscle enough to injure deep muscle tissue and rupture blood vessels, allowing blood to pool beneath the skin.
Sources
- Random Bruising: 13 Possible Causes Excluding Obvious Injury (healthline.com)
- https://my.clevelandclinic.org/health/diseases/22336-muscle-strains (my.clevelandclinic.org)
- https://www.webmd.com/fitness-exercise/muscle-strain (webmd.com)
- https://orthoinfo.aaos.org/en/diseases--conditions/muscle-strains-in-the-thigh/ (orthoinfo.aaos.org)
- https://www.mayoclinic.org/first-aid/first-aid-bruise/basics/art-20056663 (mayoclinic.org)
- https://www.livestrong.com/article/505433-bruised-legs-after-exercising/ (livestrong.com)
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