Red spots on the glans can be seen in a variety of conditions, including pearly penile papules, glansitis, syphilis, condyloma acuminatum and other diseases, and can also be caused by sweat, clothing and other environmental factors. 1. Pearly penile papules: show pearl-colored or light red papules, not fused with each other. Along the posterior edge of the glans coronal groove arranged in a row or several rows, sometimes around the entire coronal groove, no self-conscious performance, can be present for life. 2. Glans: It shows erythema, erosion, oozing and ulceration of the glans, accompanied by burning or itching sensation. 3. Syphilis: this is a sexually transmitted disease, the damage on the glans can show symptoms such as erythema and papules on the glans. 4. Condyloma acuminatum: It is mainly transmitted through sexual behavior, with light red papules on the glans, coronary groove, urethral opening, etc., without obvious self-conscious symptoms. 5. Environmental factors: such as sweat, clothing and other external stimuli, can also cause the glans to grow red spots, need to pay attention to. It is recommended to go to the hospital in a timely manner, after clarifying the specific causes, targeted treatment under the guidance of the doctor.