Does bleeding from the gum of the fasting person break his fast?
Bleeding from a person does not affect the fast, but he should try to avoid swallowing it as much as possible. Similarly, if his nose bleeds and he tries to avoid swallowing it, there is nothing incumbent upon him in this regard and he is not obliged to make up for it.
Shaykh Muhammad bin Saalih al-`Uthaymeen
Fatawa Arkaanul-Islaam, DARUSSALAM, Vol.2, p.659