Small particles on the skin in the middle of the penile body may be normal hair follicles or may be due to sebaceous gland hyperplasia, contact dermatitis, etc. 1. Normal hair follicles: small particles on the skin in the middle of the penile body may be normal hair follicles. 2. Sebaceous gland hyperplasia: the etiology is unknown, it may be related to trauma, inflammation, stimulation, friction and other factors, which can cause pimples on the skin, and may also lead to small particles on the skin in the middle of the penile body. 3. Contact dermatitis: skin contact with external sensitizers can cause an allergic reaction, may also lead to small particles on the skin in the middle of the penile body, mostly accompanied by itching and other symptoms. If it is a normal physiological phenomenon does not need to be treated, if there is a disease need to consult a doctor in a timely manner, follow the doctor’s instructions for treatment.