Dense small yellow dots on the foreskin may be caused by eczema of the foreskin, genital herpes, inflammatory reaction and other reasons. 1. Eczema of the foreskin: If the foreskin is suffering from eczema, there are small yellow dots on the foreskin that are densely packed with the size of a grain of corn and accompanied by itching. 2. Genital herpes: caused by herpes virus infection of the skin and mucous membranes of the genitourinary organs and other parts of the skin, there will be dense small yellow dots on the foreskin, and accompanied by pain, itching and other discomforts. 3. Inflammatory reaction: when the patient does not pay attention to the local hygiene of the penis, it will be easy to lead to bacterial, fungal invasion caused by infection, may appear on the foreskin with dense small yellow dots of symptoms. When the patient on the foreskin appeared dense small yellow dots, should go to the hospital in a timely manner, clear the cause of the disease and follow the doctor’s instructions for treatment.