Do you suffer from any allergy
or repeated upper rerpiratory tract infections. I hope you are not into the habit of picking at your nose because that can lead to dryness and scab formation and every time scab is removed, it may cause bleeding. Avoid touching your nose and removing the scab, drink plenty of water, take an antiallergic, and keep the room air moist by using a humidifier. You should also consult an ENT specialist
who will examine your nose and rule out any other pathology.