Would penicillin cause a rash on your neck?

Yes, penicillin can cause a rash on your neck. This is a common side effect, and it usually occurs within a few days of taking penicillin. The rash can be mild and itchy, or it can be severe and painful. In some cases, the rash may also spread to other parts of the body, such as the face, chest, and arms. If you experience a rash while taking penicillin, it is important to see a doctor right away. The doctor can determine if the rash is due to penicillin or another cause, and they can prescribe treatment to relieve your symptoms.