My 6 year old son had a photosensitive reaction to Omnicef on his...

My 6 year old son had a photosensitive reaction to Omnicef on his 10th and final day. That night it appeared as if he had gotten sunburned but he was also crying that his feet and palms were itchy. The next morning we could see welts on his trunk that moved to his arms and legs. The rash moved around and gradually improved over the next week. But now, three weeks later the welts/hives are back again and seem to be getting worse. They went from his trunk, to his arms and legs, and are now on his face, scalp, and ears, and his feet. Omnicef is not suppose to be photoreactive from what I have read, but this is the only thing that could have caused my son's reaction. My advice - do not take any antibiotic unless the condition is life threatening or will end in a loss of function.