The redness of the skin on both sides of the crotch with mucus may be caused by physiological factors, but also skin diseases, genitourinary diseases and other causes. 1. Physiological factors: and underwear is not breathable, sweat more related, should pay attention to wear cotton, breathable underwear. 2. Skin diseases: vulvar eczema, folliculitis, etc., due to inflammatory stimuli, increased secretions, crotch skin redness, patients are often accompanied by itching and other symptoms. 3. Genitourinary diseases: such as vaginitis, urethritis, etc. can also be due to inflammation of the secretion increase stimulation of the skin and crotch redness on both sides, mucus increased phenomenon. 4. Fungal infections: such as ringworm and other fungal infections, there will also be redness of the skin on both sides of the crotch and accompanied by the phenomenon of mucus. Redness and mucus on both sides of the crotch may also be caused by other reasons, when the situation should be timely consultation, usually should pay attention to local hygiene.