nosebleed is epistaxis. Because of the position of the nose - right in the middle of the face - and its high density of blood vessels, most of us will have had at least one nosebleed at your time throughout our lives.
Spontaneous nosebleeds are fairly common, especially in children. When the tissue layer (a mucus-secreting tissue inside the nose) dries, crusts, or cracks and is then disturbed by nose-picking, it's possible to bleed.
Because the nose is full of blood vessels, any minor injury to the face can cause the nose to bleed profusely.