Flesh grains on the penis may be caused by an allergic reaction or a viral infection, such as warts. Those caused by allergies usually subside in a short period of time, while those with viral infections are advised to go to the hospital in time. The penis is an intimate and important part of the male body, and it is also a very sensitive part of the body. When allergy symptoms occur in the penis, it can lead to small meatballs growing under the skin. However, it usually does not last very long and will gradually disappear in a week or so. At this time, patients should not worry too much, pay attention to observe whether the symptoms disappear, usually should pay attention to personal hygiene. The viral infection caused by the male penis subcutaneous growth of small meatballs, belongs to a sexually transmitted diseases, its typical symptom is in the genital organs of the growth of cabbage pattern small sarcoma, such as warts. Most patients have a history of unclean sexual intercourse. It is recommended that the patient go to the hospital in time for examination, and pay attention to avoid unclean sex. When you find the penis long flesh grain, it is recommended that the patient go to the hospital in time, clear cause of the disease under the guidance of the doctor treatment.