Quote Originally Posted by mlededee
sometimes i cricket leg can scrape or catch on a geckos mouth and irritate it. it could also be mouth rot as brad suggested. try to dab at it with a q-tip moistened with chlorhexadine/novalsan or betadine if you don't have chlorhexadine. if it come off readily clean the area with more chlorhexadine/betadine and keep an eye on it. the betadine will stain his skin but it will fade and go away the next time he sheds. if the crusted area comes back repeatedly you might need to take him to a vet.

i'd still like to see a pic if possible, to determine more accurately what it might be...
We just cleaned the tanks. Where can you get the Chlorhexadine ? I'll look at it again and see if it could crickets parts.
Thanks,
Scott