No this is no trick photography my friends. Tumors are very common in our farm animals flesh, but the flesh is cleaned out on the outside and the meat is still salable. Ask any butcher.
There is nothing unusual with purulent tumors in the animal flesh you buy. They cut the tumor off and wash the pus away with a lot of bleach, then after it is cleaned out they sell it to you and you have steak or roast for dinner. And the meat in your burgers or hotdogs is not any better and probably not cleaned out as “good” as the guy who worked at your local butcher shop.
Bon appétit folks!!!