Itchy penis around 2 centimeters can be caused by local dirt irritation, germs infection and allergic reaction. 1. Localized dirt stimulation: If the patient does not pay attention to the personal hygiene of the penis, non-infectious itching or pain may occur due to localized dirt stimulation, which may lead to itching and pain in the penis around 2 cm. 2. bacterial infection: if the patient’s penis has a bacterial infection or fungal infection, there may be infectious itching or pain symptoms, resulting in itching and pain in the penis about 2 centimeters, and there may also be localized redness, swelling, or ulceration and pus phenomenon. 3. Allergic reaction: when the patient has a local allergic reaction to the penis, edema, itching, pain symptoms will occur, resulting in the occurrence of penile itching and pain in the 2 cm or so position. Therefore, once the phenomenon of penile itching and pain, it is recommended that patients go to the hospital in a timely manner to carry out relevant examinations, to clarify the cause of the disease, for treatment.