Itching outside the nose may be related to allergic contact dermatitis, insect bite dermatitis, seborrheic dermatitis and other diseases.
1. Allergic contact dermatitis: when the skin on the outside of the nose comes into contact with a chemical irritant, an allergic reaction at the site of contact can occur, with localized redness, swelling and itching.
2. Insect bite dermatitis: When the outside of the nose is bitten by mosquitoes, ticks and mites, the venom stimulates the local immune response, and the bite site may appear red, swollen and itchy.
3. Seborrheic dermatitis: this disease can be associated with Malassezia colonization, lipid increase, impaired skin barrier function, immune response and individual susceptibility. It is easy to occur on both sides of the nose, nasolabial folds at the seborrheic overflow area, which can be manifested as dandruff, crusting and itching.
When the itch outside the nose persists unrelieved, recurrent or accompanied by other uncomfortable symptoms, there are other possibilities, you can actively seek medical examination to clarify the diagnosis and causes.