It’s most likely that the poor hog has been artificially marked, particularly if the lines are fairly straight and vaguely parallel to each other. But try to get a better look just in case it has a strimmer injury. (This is another reason why it is such a bad idea to artificially mark hogs, because the markings could be mistaken for injuries – as if all the other reasons not to do it weren’t good enough!)
If you are able to load the photo to somewhere else on the internet, it should be possible to put a link here. Alternatively you could load them on here via the home page, but that might take a few days before we can see them. To get an image here quickly, you could temporarily use it as a profile picture – that is almost instant – and might give us an idea of what you mean.