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He obviously roided during his last aew days and roided again when he made his RR return in WWE and that may be on of the reasons he got injured.
Muscles gain mass and strength but the ligaments and tendons are not well adapted into handling the new greater mass and strength and thus they get teared off.
That picture is blurry and doesn't show much, but I hope that he won't continue roiding more, he was pretty gassed in his match against Dom and in the RR.
I love Punk and I hope he gets more into cardio and mobility, yes, looking huge is good on cam but not good for match quality and for his health.