Nose hair redness and swelling is mainly caused by mosquito bites, folliculitis, nasal boils and rosacea. 1. Mosquito bites: After the nose is bitten by mosquitoes, the skin will ooze tissue fluid, which will lead to redness, swelling, itching and other symptoms of the nose. 2. Folliculitis: Nasal skin with excessive oil secretion can easily block the pores, resulting in bacterial infection of the hair follicles, which can lead to symptoms of redness and swelling of the nose. 3. Nasal boil: limited purulent inflammation of the hair follicles, sebaceous glands or sweat glands at the tip of the nose. There will be symptoms of redness, swelling, heat and pain at the tip of the nose, and redness and swelling of the nasal hair. 4. rosacea: a kind of chronic skin damage centered on the external nose, manifesting nose skin flushing, capillary dilatation and papules, pustular nasal cumbersome. Nose appears red and swollen need to go to the hospital in time to check the specific causes and treatment, so as not to delay the condition.