Final answer:
Subdermal venous bleeds are nosebleeds caused by veins under the skin.
Step-by-step explanation:
Subdermal venous bleeds are nosebleeds that occur from veins under the skin. It means that Hailey's nosebleeds are originating from veins located beneath the surface of her skin. This can be caused by various factors, such as trauma, elevated blood pressure, or certain medical conditions.
Learn more about Subdermal venous bleeds and their meaning