The fiery pain of foreskin may be caused by foreskin injury, inflammation and infection, allergy and other factors. 1. Foreskin injury: for example, too much force during sex, or the foreskin is stimulated by foreign objects, resulting in localized breakage of the foreskin, there will be a hot pain, which may also be accompanied by redness; 2. Inflammatory infections: when the foreskin is locally infected by bacteria or fungi, after being stimulated by inflammatory substances, it will cause localized burning pain, which may be accompanied by swelling, itching and other symptoms; 3. Allergy: for example, allergy to underwear and other clothing materials or allergy to condoms, so that there is an allergic reaction to the foreskin, which will make the foreskin hot and painful, accompanied by itching and redness. If the foreskin persists in pain, it is recommended to seek medical attention to avoid adverse effects.