This will depend on your dong and the way you use your penis extender. Of course, the expected results include an increase in penis size, which can also boost your stamina, arousal, and sexual confidence. Mild discomfort is unavoidable. But that will manifest itself as a feeling of soreness, similar to the one you’d get after a workout. Some of the negative side effects are skin irritation, chafing, redness, and pain. They can come about if you use your penis stretcher for too long or incorrectly. In this case, you should see a doctor or contact the manufacturer.