According to the National Cancer Institute, sores inside the nose that do not heal can indicate nasal cavity cancer. Additional signs of nasal cavity cancer include headaches and pain in the sinus area, nosebleeds, lumps inside the nose, pressure in the ear and numbness or tingling of the face. It is important for anyone experiencing sores in the nose to consult with a physician to ensure an accurate diagnosis.
The Lupus Foundation of America explains that sores inside the nose are a common symptom of lupus, an autoimmune disease. Sores in the nose due to lupus are referred to as mucosal ulcerations and can also be found in the mouth and in vaginal tissue lining. In most cases, lupus ulcers do not cause pain and can resemble cold sores.
A sore inside the nose can be caused by a common cold, a viral infection or nasal allergies, according to WebMD. An injury to the nose caused by a blow to the area or nose trimming can also cause sores inside the nostrils.
Individuals with allergies or sinus infections commonly experience sores inside the nose, explains WebMD. Irritation from a runny or stuffy nose can cause sores to form due to drainage that irritates the interior of the nose. People with colds or allergies should attempt home treatments such as nasal rinses, nasal spray or a decongestant to minimize drainage.
According to WebMD, sores around the nose are a symptom if impetigo, a condition that is common in children. Impetigo is caused by bacteria and often coincides with allergies and colds due to the fact that constant rubbing of the nose can create raw skin, making it easier for bacteria to enter the area; however, impetigo can develop on healthy skin. Impetigo sores are red and painful. The sores often ooze fluid and form crusts. Impetigo is diagnosed by visual examination and lab cultures that detect bacteria.