Redness and itching on the opening of the glans may be related to glansitis, glans eczema, genital herpes and other causes. 1. Glans inflammation: If the glans is infected by bacteria and other pathogens, it can cause an inflammatory reaction, which is manifested as redness, swelling and itching on the opening of the glans. 2. glans eczema: if eczema occurs on the glans, papules will appear on the basis of red spots, which can manifest as redness, swelling and itching. 3. Genital herpes: it can be manifested as blisters, vesicles or ulcers at the glans, which can be accompanied by redness, swelling, itching and other symptoms. It is recommended that the red itchy glans go to the hospital in a timely manner, to clarify the cause of the disease, under the guidance of the doctor for standardized treatment, so as not to delay the condition of the body to bring adverse effects.