Red bumps on the glans usually refers to the red rash on the surface of the glans, which may be caused by infectious factors, condyloma acuminatum, and allergic factors. 1. Infectious factors: men do not pay attention to the cleanliness of the glans area, may induce glansitis, due to inflammatory substances stimulation, it will lead to localized red rash on the glans, may also be accompanied by itching, oozing, pain and other symptoms. It is especially easy to appear when the foreskin is too long. 2. Condyloma acuminatum: usually associated with unclean sex, will make the glans appear reddish pimples, the shape of the cauliflower pattern, and accompanied by mild itching and pain, the area will gradually increase, and is infectious. 3. Allergic factors: for example, the use of poor quality condoms or the use of more irritating toiletries, so that the glans has an allergic reaction, can lead to the glans to appear red rash, the number of more, accompanied by itching. Rashes on the surface of the glans are recommended to be examined and treated accordingly to avoid delaying the condition.