go to a highly reputable piercing shop (I go to Pain and Wonder in Athens for everything), and there should be no problems.. let them know that his skin rejected one.. 90% of the time, skin rejects piercings because of the metal in the bar/ring, and/or the weight of it.. if he had it done with a steel ring (which is common), look at other metals... surgical stainless steel is ok, niobium is awesome... look for something without nickel in it as that seems to be the main troublemaker. Also, go with a bar instead of a ring.