Inside the foreskin, the pimples around the coronal groove may be caused by circumcision, glans, warts and other reasons. 1. Prolonged foreskin: some men do not clean the foreskin for a long time, there can be prolonged foreskin, easy to greasy secretions or dirt and other substances hidden inside the foreskin, the above substances are prone to cause irritation to the surrounding skin, then there can be a symptom of the inside of the foreskin, pimples in the coronal grooves. 2. glansitis: unclean sex or poor hygiene habits, can induce glansitis by the inflammation of repeated stimulation, the foreskin inside the coronal groove of the pimples can also be accompanied by pain and burning sensation and other performance. 3. acromegaly: men and acromegaly patients have sex easily induced HPV infection, suffering from acromegaly. The disease will cause irritation to the skin inside the foreskin, appearing around the coronary groove pimples as well as the manifestation of superfluous organisms. Inside the foreskin, pimples around the coronal groove may also be caused by other reasons, such as genital herpes, etc. You should go to the hospital in time to clarify the cause of the disease and choose the appropriate method of treatment.