My ds has been potty training for 6 weeks or so and is doing well. However, a problem that has surfaced is that he seems to have a reaction to the plastic of the potty/toilet seat. If he sits on the loo for more than half a minute, he is left with big red welts across his bottom where he touched the plastic. These then go all dry and crusty - it's really awful, far worse than any nappy rash he ever had. I have bought him one of those padded plastic-covered seat reducers, which is better, but he still gets a reaction to it. I'm going to take him to Dr but I was wondering if any mumsnetters had a similar experience? Dh bought a wooden loo seat but it didn't attach properly to our loo so we have to find another one. I'm worried that this reaction indicates an allergy to plastic or some chemical in plastic which might be more serious in future. I get a rash from some kinds of rubber gloves - is this the same thing?