There isn't sufficient information to reach a specific diagnosis. There is a possibility of nasal vestibulitis or trauma to the nose. Nasal vestibulitis is the diffuse dermatitis of nasal vestibule. It is often caused by Staphylococcus aureus. It may be secondary to chronic rhinorrhea, nose picking or viral infections. In acute vestibulitis, the skin is red, swollen and tender. I would advise you to visit an ENT so that you can be examined and undergo the necessary investigations to find the underlying cause and have it treated accordingly. If the conditions persists or worsens visit the ENT at the earliest.

Can't say accurately..but nasal vestibulitis should be ruled out. take analgesic tablet sos for pain relief.. visit an ENT specialist for proper assessment and treatment.