If its the same as inland beardies its normally a sign of stress,,,,can be due to being to hot/cold, hungry, scared, or just generally under the weather
if its on top of their body, probably just darkening his colour to absorb more heat.
but yeh as nat said if its under the body and beard then they are gnerally just pissed off, sometimes it can be nothing you've done wrong, they just feel annoyed and stressed
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