Red spots on the glans are painless and itchy, and may be caused by chronic glans, syphilis, and pearly papules. 1. Chronic glans: often accompanied by phimosis, phimosis phenomenon, long-term accumulation of foreskin scale will lead to bacterial infection, the skin will sometimes appear red rash, usually accompanied by a tingling sensation, but may also be manifested as painless and itchy. 2. Syphilis: it is a common sexually transmitted disease, such people can also appear red rash, painless and itchy symptoms, can appear chancre, sclerosing lymphadenitis symptoms. 3. pearly papules: may be due to the long foreskin, foreskin scale caused by long-term bacterial sensation, can appear white fat particles, usually no itching nor pain, usually do not need special treatment. If there is a red spot on the glans without pain or itching, it is recommended to consult a doctor in time, under the guidance of the doctor.