How come i have random nose bleeds in only one nostril?

Nose bleeds: Your recurrent nose bleeds may be due to a broken blood vessel on that side of your nose. Here are some other reasons for nose bleed reasons: nasal congestion or nasal dryness, ^ blood pressure, excessive use of decongestants, nose picking, or blowing the nose hard. I suggest you see an ear/nose/throat specialist for further evaluation.