what are tear stains on humans

Tear stains on humans are typically the result of porphyrins, which are naturally occurring molecules containing iron and are waste products from the breakdown of red blood cells. When tears containing porphyrins sit on the skin around the eyes for a period of time, staining occurs, resulting in reddish- brown streaks. This staining can be caused by excessive tear production, insufficient tear drainage, or a combination of both. It can also be a symptom of a serious eye health problem. Medical causes of tear staining can include various eye infections, glaucoma, inverted eyelids, and other underlying health issues. It's important to consult a veterinarian or a medical professional to rule out any medical causes before assuming it's a simple matter of too much tear production