Blaze, I think with most of the girth oriented exercises you will find these "UGLY" issues with the skin. Someone who Penis Enlargement's usually bares the signs of this exercise on their skin. Darkening, stretch marks, bruising and other skin issues may appear with any of the girth exercises. I think most men accept the skin problems with the bigger dick they get. Although I have many of the skin marks of a Penis Enlargement'er, my girl loves the look.