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Pentasa and Skin Problems

Has anyone had trouble with rashes or reddening of the skin while on Pentasa? I've been on it for many years and recently started breaking out in a rash. I was on Prednisone for a bit and the rash got better, but flared up as soon as I stopped taking it. The rash is on my legs and arms. All tests have come back negative for anything serious, so I'm thinking it has to be the Pentasa. Thanks!