Please help! my dad had a liver transplant almost 2 years ago and has been doing great!?

but for the last 2 days he has been having burning sensations on and around where they cut him open! any ideas why? also he only has he feeling when he lays down. he put a wet towel on his stomach and that did seem to stop the burning feeling! i told him to call his dr but we are waiting for the call back.
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