younger children bleed very easily. the smallest cut can bleed like a major laceration. since the nose is highly vascular it takes very little for it to bleed. a probing finger (even if you have not seen it) dry environment allergies colds etc. once the nose bleeds a scab forms but because the lining of the nose is a mucous membrane the scab tends to fall off. resulting in another bleed often from the same exact spot. recurrent nose bleeds may require a simple chemical cautery that can be done in the office. momentarily unpleasant this often solves the problem you can also coat the inside of the nose with saline gel or vaseline to keep things moist. discourage any nose-picking. your child may be different but the preschooler in my practice make nose-picking into a fine art form. you can read more about nosebleeds by putting epistaxis into you webmd search engine.
what causes bloody noses in a preschooler? it's always from her left nostril. . she's not picking at it. it just starts bleeding. and there is usually blood in her mouth as well.