If his mouth is swollen and there is crusty stuff around his lips then it is mouth rot. You can stop this if you catch it early enough by completely cleaning everything (including his tank) with anti-bacterial soap and clean his lips with water diluted hydrogen peroxide (1/2 and 1/2 mixture). You can even put a little triple anti-biotic ointment on it but not too much... and try to avoid putting it on the inside of his mouth. If you need anymore help let me know and i'll be glad to help!
GOOD LUCK!
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