It really does look like there's a 9 there but I agree with the previous posts... It's more than likely a stain
You know what's interesting? Not very long ago, it was AT/NT. Every other person just about who came on here had a coin and that question on it. That faded, and now its errors, and more than we've ever cared to see in our lives. How do these cockeyed fads start? Did you ever ask yourself that? I really do think they're promoted. PCGS promoted that whole AT/NT thing, with its federal complaint against the coin doctors that was dismissed after six months for failure of service, and its very own polygraph "coin sniffer" machine. If they hadn't dreamed it up, they moved it along, and for every nickel and dime they could get out of it. Now everyone who comes on here, instead of seeing coin doctors around every corner, are seeing errors. This is too good to have just started by accident, that's all I'm saying.
Welcome to the neighborhood @Stephanie2003. The year that coin was minted, they were still mostly copper and it is a soft metal that can be fairly easily moved and marked. While I'm not sure what occurred to make your coin look like this, I don't believe it is any type of mint error, but keep on looking. BTW, Full Size photos would make it easier to see the area you are asking us questions about. Here is a suggestion I make to many members. You should always post in focus FULL IMAGE photos (after you upload your photo, two buttons appear: Thumbnail and Full Image, click Full Image and your photo appears full size on your post and is easily enlarged by clicking on it). Photograph coins on neutral backgrounds like black, grey, or white. Crop out superfluous background so just the coin shows, and post photos with correct orientation so members don't have to turn their computer in some awkward fashion to view it properly. While it isn’t always necessary, it is nice to show both the obverse and reverse, even if your question is just about one side. Members can often give more valuable information having both sides to evaluate. Add close ups of areas you have questions about and make your questions as definitive as possible so we know what you are asking for. And try to have the best lighting possible to show the most favorable photo of the coin. Hope this helps in the future. Good luck.