It *is* cutting. Wu is a god-damned idiot.
Look at the cuts. Really look at them and indulge your inner CSI. What story are they telling?
You've got the two deepest ones, exactly parallel to each other and perpendicular to the arm. Those were probably the first. Next were the two diagonal ones. They're also parallel to each other, but the distance between them is greater. This is because she was using the first two cuts as reference points, notice how they intersect perfectly at the top and bottom.
The ones below those are fainter, probably running out of steam at this point. They're mostly parallel and still two of them since people really like to indulge the desire for symmetry. Notice that she had to double cut the lower one to make it long enough, while the upper was polite enough to stop short before it crossed over the previously made cut - considerate car!
The ones on the bicep were added a bit later to make things a bit more random looking; but it also means she would have had to have slid in *five* directions after impact.
All the wounds show the blood "dotting" effect of a sharp instrument pressed just deep enough to draw blood. All the wounds are on the *inside* of the arm. And someone tell me is even Wu too dim to notice the previously inflicted and now healing injuries on the forearm? How many cars is this woman jumping in front of?
Soooo... there was a brief period in my life when I was engaging in fantastic self-destructive sex with a fantastically self-destructive girl. I claim expert testimony.
....another question would be, how these scratches get there in the first place.
I don't think she wants to say that the cause for these scratches is, that she was hit by a car. Unless it was a truck loaded with shattered pottery, you don't get these kind of scratches from getting hit by a car, period. So I guess they are supposed to be dog scratches.
As pointed out, those scratches are all on the inside of her arm and all of them they are solitary, there are no parallel scratches as you would expect from a dog scratch. Also, considering the number of scratches she has, the dog either has only one claw on each paw, or it wasn't a dog that did this.
She must have held or interacted with that dog for at least a few seconds, otherwise you can't explain the number of scratches on her forearm. We can also expect that, if she had more scratches elsewhere, she would have probably posted them, not just the one arm. I also have trouble to imagine a way to hold, push, move or carry a dog, that involves exposing the inside of my left forearm that much to it, in a way that most of the scratches are made horizontally. You can also see, that some of the marks on the right side of her arm are more crooked, which is exactly the spot where it is harder to move in straight lines if you cut yourself.
We should also note that this is her non-dominant arm, judging from other selfies she did.
Thirdly, no bite marks. Dogs usually
bite if they are scared, so that she doesn't show us a bite mark is rather suspicious. The dog really needed to be in some distress to cause so many deep scratches, so a bite should be in there somewhere. And if you look at those scratches, where they are placed and how big and long some of them are, it was certainly not a small dog who supposedly did that. Bites from big dogs are not fun, not fun at all. Granted, the dog could have been muzzled, buuuuuut....
Fourth, she claims that she saved the dog
from being hit by a car. She also claims to be a writer, so I don't think she mixed up "after" and "from". So we can assume that she somehow pulled a bigger, mono-clawed and muzzled dog off the streets... or prevented it from running onto the street. Something you usually do by grabbing the collar, and if you grab the collar with your right hand, you usually don't get those kind scratches, except you kneel down and present the dog your left arm to scratch all over it.
...so yes, she cuts herself.