What causes pain and swelling underneath penis foreskin?
Patient: The banjo on my penis is very swollen underneath and very sore. The foreskin will not go back into place.  What is causing this. When it first swelled passing urine was painful.  This is the 2nd time this has happened, the first time it swelled for the evening and then subsided again.  This time it has remained swollen for the past 6 hours. Doctor: Hi,.There are many reasons for the swelling underneath the foreskin of penis, both STD and Non-STD causes. Sometimes insect bite and allergic reaction also manifest like this. Any infection of Glans penis or just an inflammation due to some irritants like topical applications, antiseptics or even soap remnant. If the cleaning of inner aspect of penis is not adequate, then also secondary bacterial infections are common and produce swelling.Yeast infection or other STD infections also can cause such swelling.You had not mentioned your age, whether you are a Diabetic individual and about your marital status and sexual activities. These information will be useful to arrive at a diagnosis.  Consult your physician he/she will help you for further investigations and for treatment. Nothing serious. DR S.Murugan