I have a young friend who purchased a young (9") Nigerian Uromastyx on Saturday at a reptile expo in Atlanta. Today (Tuesday) he called me, concerned about a white chalky substance apparently emanating from both nostrils. My first thought was an RI, but I continued to question him about other possibilities, including it being residue from additives such as calcium or potassium. That's a negative. Unsure of basking and housing temps, he says the lizard is eating well and is active. While writing this, I remember that the tank (not even sure how big it is) was previously home to a leopard gecko (presently healthy) that he rescued and gave to me, which may give credence to my current RI theory. Any thoughts from you uro owners (I've never had one) on what the malady, if any, is? I promised him I would try to get back with him tomorrow, so a prompt reply is greatly appreciated.