A good picture would help. Often the white stuff is excess mucous and a reaction to something such as bacteria, parasites (usually protozoa), or chemical (inorganic irritant). Although, it's strange that the patch is localized around the mouth. How long have you had the fish; and have you added anything recently? Off the top of my head, and if you don't see any discreet whit spots associate with the white stuff, could be the start of Brooklynella infection? Or just a local reaction to an irritant?
Last edited by Rondelet; 06-12-2006 at 10:31 PM.
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