The redness and itching of the glans may be caused by bacterial glans, fungal glans, and allergic factors. 1. Bacterial glans: infrequent cleaning of the glans area may lead to local bacterial growth, which may cause redness and itching of the glans, accompanied by tingling. 2. Fungal glansitis: the presence of unclean sex or the presence of ringworm in men may cause fungal infections in the glans area, inducing fungal glansitis, which may lead to itching of the glans. 3. Allergic factors: for example, contact or consumption of allergic substances, so that the glans localized allergic reaction, may lead to redness and itching, and also accompanied by tingling. Red and itchy glans, may be the existence of the above diseases, it is recommended to consult a doctor for examination and treatment.