The redness and itchiness of the glans is mostly due to glansitis or localized allergies, and it is recommended to go to the hospital for further examination to make it clear. Specifically as follows: 1, bacterial glans can appear red, itchy and can be accompanied by local oozing, erosion changes, can also be accompanied by superficial ulcers, etc. 2, fungal glans can also appear red, itchy, can be accompanied by erythema of the glans, erythema clear boundary, erythema surface can be white secretion, accompanied by local itching, the need to carry out further examination of the fungus to further confirm the diagnosis. 3, trichomoniasis Trichomoniasis can also appear red, itchy symptoms, can be accompanied by erythema of the glans. Most of them are infected through unclean sexual contact, can appear localized erosion, oozing changes, need to carry out trichomonas related examination to confirm the diagnosis. 4, local allergies, such as contact allergens, common contact with condoms allergy can appear localized redness, itchy, but also accompanied by localized rashes, and other changes, need to carry out further allergens testing to confirm the diagnosis.