Are you referring to the white stuff on the bp left side? I see what could be a small amount of possibly substrate. What substrate are you using? The area doesn't appear to be swollen but we do need a bigger pic and a more clear pic. Anyway, just keep an eye on it. Bps sometimes get stuck substrate under the jaws that protrude out but they are pretty efficient at removing it themselves. Stay in peace and not pieces. Good luck. Hurry up with the new pics!