The redness in front of the foreskin may be caused by physical stimulation, glans phimosis, allergy and other factors. 1. Physical stimulation: such as frequent masturbation or foreign body stimulation, will lead to redness in front of the foreskin, eliminate the triggers can be recovered independently, do not need to carry out other treatments. 2. glans phimosis: the presence of long foreskin, long time poor hygiene, will induce glans phimosis, stimulated by inflammatory substances, will make the front of the foreskin red, accompanied by local itching, tingling and other symptoms. 3. Allergy: for example, allergy to toiletries or condoms, so that the foreskin localized allergic reaction, will lead to redness, accompanied by intense itching and tingling and other symptoms. Redness in front of the foreskin and other abnormal manifestations, it is recommended that patients seek medical examination and treatment as soon as possible to avoid other complications.