The redness and swelling of the tip of the nose is considered to be related to skin allergy, local folliculitis, mosquito bites, nasal vestibulitis and other diseases. 1. Skin allergy: if contact with certain allergic substances may cause redness and swelling of the nose or other parts of the nose, and there is pain when touching. 2. Local skin infections: Bacterial infections in the tissues surrounding the hair follicles in the nose can cause redness, swelling and pain in the skin of the nose. 3. Mosquito bites: After mosquito bites the nose, the local skin can show obvious redness, swelling, pain, itching and other symptoms. 4. Nasal vestibulitis: after bacterial infection in the nasal vestibule, there can be redness and swelling of the nasal mucosa, increased secretion, and the tip of the nose has obvious redness, swelling and pain. When the nose is red, swollen and painful to touch, you need to go to the hospital in time for examination and clear diagnosis to avoid delaying the condition.