The red itchy foreskin is most commonly associated with phimosis and glans phimosis, which requires prompt medical attention to identify the cause. 1. Hyperemesis gravidarum: secretions are discharged from the inner plate of the foreskin, but if the foreskin is too long, the secretions are wrapped up and difficult to clean, thus making it easy to form foreskin scale. When the glans and foreskin are irritated, it may lead to red itchy foreskin. Therefore, if the foreskin is too long, you need to often turn up to reveal the glans coronal groove, use water to rinse, keep dry. 2. Inflammation of the foreskin and glans: when inflammation of the glans occurs, pathogens and inflammation will affect the local skin, therefore, patients may experience more intense itching, redness and swelling. Other causes such as eczema can also cause red and itchy foreskin, it is recommended that patients go to the regular hospital, according to the cause of treatment.