Why did Dmitry Bivol have perfectly circular welts and gouges on his arm?

Round, raised welts and gouges, like he was hit repeatedly with something a little bigger in diameter than a bottle cap. What the fook was that? Did anybody else find that weird? Canelo has gone from an accumulation puncher at 154, to punching holes in people's arms at 175? Wtf? https://youtu.be/ARRP62DOI1A?t=122 {"data-align":"none","data-size":"full","title":"bivol8.jpg","data-attachmentid":31408051} The same happened against Callum Smith, he turned Callum's bicep and triceps into ground meat. {"alt":"Click image for larger version Name:\tcallum-smith-arm.jpg Views:\t5 Size:\t200.1 KB ID:\t31408045","data-align":"none","data-attachmentid":"31408045","data-size":"full","title":"callum-smith-arm.jpg"} This is super shady. Anyone who tries to explain it away is complicit. The Mexican beef is bad enough, but this is going too far now.