One side of the nose is hard and painful when pressed may be caused by folliculitis, acute nasal vestibulitis, nasal boils and so on. 1. Folliculitis: It is usually a purulent inflammation formed when a single hair follicle becomes infected. It occurs on the scalp, face and neck, chest and back. When folliculitis forms in the nose, red papules centered on hair follicles may appear on the skin surface, and symptoms such as hardening of the nose and pain when pressed may occur. 2. Acute Nasal Vestibulitis: It is usually a diffuse inflammation of the skin of the nasal vestibule. Prolonged runny nose, frequent picking and rubbing or friction can lead to acute nasal vestibulitis. This leads to symptoms of redness and swelling of the unilateral nasal vestibule area and pain on pressure. At the same time, it can also lead to local skin cracking, hardening, erosion and so on. 3. Nasal boils: For example, pulling out nose hair, frequent nose picking, and secondary infection after injury to the nasal vestibule or external nose and accessory sex can lead to limited acute purulent inflammation of the hair follicles, sebaceous glands, or sweat glands in the nasal vestibule, tip of the nose, and nose, etc. The nasal boils can also lead to the development of hardening, swelling, and pain on pressure. This leads to symptoms of hardening of the nose and pain when pressed. When the nose is hard and painful when pressed, you should avoid bad habits such as blowing or picking your nose and keep the area clean to avoid aggravating the symptoms. It is recommended to go to a regular hospital for consultation, to clarify the cause of the disease, and then carry out targeted treatment.