A small bag on the glans can be considered as genital herpes, condyloma acuminatum, sebaceous ectasia or tuberculosis rash on the penis. 1. Genital herpes: When herpes simplex virus (HSV) infects the genitals and perianal skin mucosa, it can lead to the appearance of scattered or clustered small blisters on the glans, prepuce, and coronal sulcus of men, which can later break down into vesicles or shallow ulcers. 2. Condyloma acuminatum: It occurs in sexually active young and middle-aged people, men can see in the glans, the coronal groove and other places at the beginning of a single or multiple small reddish papules, the tip of the tip of the tip, the texture of the softer, and can gradually increase in size for the warts, usually acetic acid white test positive. 3. Sebaceous ectasia: yellowish-white pimples can appear on the male glans raised above the skin, which can be scattered, and some of them will be fused into patches. 4. Penile tuberculosis rash: generally less common, can appear in the glans or the coronal groove of the normal skin color or red pimples of the size of a grain of rice or pea grains, can be pus broken to form shallow ulcers, can be left behind after the healing of atrophic scarring. When pimples or lumps of unknown nature appear on the glans, it is recommended to consult a doctor in time and follow the doctor’s instructions for treatment.