The redness and swelling of foreskin and glans may be related to circumcision and glansitis, glans allergy, foreskin incarceration and so on. 1. Foreskin and glans inflammation: due to long foreskin or prepuce, the accumulation of foreskin scale stimulates the foreskin and glans, causing infection of bacteria, trichomonas, fungi and other microorganisms, which triggers inflammatory reaction of the foreskin and glans, and redness and swelling of the foreskin and glans appear. 2. Glans, foreskin allergy: some people have sensitive skin, when condoms and other items come into contact with the glans and foreskin, it is easy to have an allergic reaction, which can also cause redness and swelling of the glans and foreskin. 3. Foreskin inlay: the foreskin is too long to be forced upward when cleaning, resulting in the penis glans inlay, due to poor blood microcirculation, causing local edema, the foreskin and glans red and swollen. There are many reasons for the redness and swelling of the foreskin and glans, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for further examination, with the help of the doctor to clarify the causes, targeted treatment or treatment.