The causes of dry and hard boogers with blood may include sinusitis, deviated septum, high blood pressure and so on. 1. Sinusitis: If you suffer from sinusitis, the mucous membrane of the nasal cavity will become fragile under the stimulation of inflammatory factors. If you are in dry air, the fragility of the mucous membrane of the nasal cavity will increase, which can lead to rupture of blood vessels and bleeding, and the nosebleed will be mixed with the boogers that are formed after drying of nasal secretion, which can be manifested as hard and dry booger with blood in a long time. 2. Deviated nasal septum: When the nasal septum is deviated, the mucous membrane of the nasal septum on the deviated side will be impacted by more airflow, which will cause the mucous membrane of the nasal septum to erode and bleed over a long period of time, and then it will be mixed with the boogers to become dry and hard. 3. High blood pressure: If the blood pressure remains high, causing blood leakage from small blood vessels in the nasal cavity, the blood in the nasal cavity will be mixed with the boogers, and then form dry and hard boogers with blood. If the booger is dry and hard with blood, you should go to the regular hospital in time to find out the cause of the disease, and under the guidance of professional doctors for treatment.