All game is going to have cysts in it, the higher the population density of the animals on the land the higher the concentration of parasites, bacteria, viruses, mycoplasma, etc. in the host population. Epizootic disease outbreaks in wild non-domestic animals are almost always due to high population densities, it is natures way of cutting down the burden on the land.
Hogs carry many intestinal worms, stomach worms, lung worms, kidney worms, etc as do all other domestic and wild game do. The larvae of the parasites travel all through the lungs, muscles and other areas of the body before they mature in the intestinal tract.
I normally check the liver for external milk spots, general color, and fibrosis, external milk spots are indicative of heavy round worm infestation. Cutting the liver with a sharp knife should be like cutting butter, if there is resistance to the blade and the hepatocytes are hardened it represents chronic disease of some nature, same with the kidneys.
Also eyeball all the mesenteric lymph nodes, any enlarged means buzzard bait.
Keep your hands out of your mouth when cleaning any domestic or wild animal and wear gloves, you could have a million worm eggs under your finger nails if you do not wear gloves.
Cook all game to proper temperature prior to eating.
Enjoy!