Two or three small ulcers on the foreskin may be caused by inflammatory diseases, sexually transmitted diseases, immune diseases and other causes, and need to be further differential diagnosis by a doctor. 1. Inflammatory diseases: such as glans penis, if the inflammatory reaction caused pimples appeared to break out, can lead to two or three small ulcers on the foreskin. 2. Sexually transmitted diseases: such as syphilis, if infected with syphilis spirochetes in high-risk sexual behavior, can cause small ulcers on the foreskin symptoms. 3. immune diseases: such as leukemia, can appear genital ulcers, mostly in the perianal area, penis and so on. It is recommended that two or three small ulcers on the foreskin to go to the hospital in a timely manner to clarify the cause of the disease, under the guidance of the doctor for standardized treatment, so as not to delay the condition.