The feeling of redness and swelling of the foreskin may be related to glans inflammation, foreskin inlay, local allergies and so on. 1. glansitis: mostly due to the lack of attention to local hygiene or long foreskin and other reasons, resulting in glans infection caused by local inflammation, spread to the foreskin to show redness and swelling. 2. Foreskin inlay: when the foreskin is too long, it may not pay attention to cleaning, resulting in mild inlay of the outer skin, causing redness and swelling of the foreskin. 3. Local allergy: may be the underwear material is poor or sexual life when contact with allergenic substances, caused by the foreskin and other local allergies, will also appear in the foreskin red and swollen. Redness and swelling of the foreskin can also be seen in other causes, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for the relevant examination, treatment or treatment with the help of the doctor.