hello doctors, before 4 months my son bang to nose that time 3 drops blood came from one nosil of nose,, we went doctos done xray to nose, they said nothing problem only hairline fracture happened doctors said,, but the thing is, 2 months or 1 and half months once single drop blood coming from same nosil, but my son is active,,, pls sujjest me why single drop blood coming 2 months or 1and half month once