There is a bag under the foreskin itching may be related to the foreskin glans, warts, sebaceous cysts and other reasons. 1. circumcision: due to the inflammatory stimulation of the foreskin, edema and itching can occur. 2. Condyloma acuminatum: initially, it is a single or multiple scattered small reddish or skin-colored papules, which may be accompanied by itching or pain. 3. Sebaceous cysts: If there is a sebaceous cyst at the foreskin, it can manifest as a bag, and if combined with infection, it can cause itching, pain and other symptoms. It is recommended to have a bag under the foreskin itchy people go to the hospital in a timely manner, a clear cause, under the guidance of the doctor for standardized treatment, so as not to delay the condition of the body to bring adverse effects.