Red lumpy spots on the glans are painless and itchy, and may be inflammation of the glans, as well as allergies and other factors, external stimuli, purpura and other causes. 1. Inflammation of the glans: external pathogenic bacterial infections, such as bacterial trichomonas, candida, etc. caused by inflammation of the glans, the symptoms are relatively mild, if the symptoms are not typical, it may cause red lumpy spots on the glans without pain and itching. 2. Allergic factors: glans contact with chemical fiber underwear or the use of soap, shower gel and other products, causing a local allergic reaction, or taking certain drugs, food and other reasons, resulting in allergic symptoms, may lead to red lumpy spots on the glans, painless and itchy phenomenon. 3. external stimulation: excessive masturbation, frequent sex or extrusion, trauma caused by subcutaneous capillary rupture, may also lead to red lumpy spots on the glans, painless and itchy. 4. Purpura: such as allergic purpura can cause subcutaneous capillary rupture, resulting in skin bleeding spots and petechiae, may also cause red lumpy spots on the glans without pain or itching. The red lumpy spots on the glans are painless and itchy, and may also be caused by other factors, so it is recommended that the patient go to the regular hospital in time for treatment and strive for early recovery.