The foreskin is red in one circle may be caused by friction, allergy, foreskin glansitis and other reasons.
1. Friction: The material of underwear is not good, the foreskin rubs against the underwear for a long time when exercising or walking, which can cause damage to the foreskin, thus leading to red foreskin, and in some cases, pain.
2. Allergy: Frequent use of stimulants such as alcohol-containing scrubs on the penis causes an allergic reaction, which may lead to redness and itching in a circle of the foreskin.
3. Glans phimosis: The causes of glans phimosis include long foreskin, poor hygiene, frequent cleaning, etc., which can lead to irritation and infection of the glans phimosis area, thus resulting in the symptom of redness in the circle of the foreskin.
To summarize, if the foreskin is red, you need to go to the urology department of the hospital for examination and treatment according to the cause.