This one is easy. Just go to history-matters and look at the mark on the forearm directly. I'll give you the link:
Now, when you get there, there is a plus icon in the lower right which you can use to hone in, to come in closer. I did it, and then I simply did a Print Screen and got this:
But, don't take my word for it. Go to the above link and enlarge it yourself using their instrument, and see what you get. You are going to get the same thing that I got, which is this:
That's what it is. So stop the nonsense. I didn't do anything to it. Unless you want to accuse history-matters of defiling it, that is what it is. And what it is is a very discreet deliberate mark on the photo, and there is no sound basis to call it anything else. It is the tail of Lovelady's arrow. We just got lucky that it overlapped the flesh-colored forearm.