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Agreed if you mean it looks like it went into the body plastic. If you try fill with just paint it'll collapse into the gap as it dries over a few days and will look very obvious. Probably needs body filler and that implies sanding and then a whole lot of skill to try semi-hide it without doing a full paint of the bumper (and hoping it mostly matches the rest of the rear end). I personally wouldn't try to do it myself.
At the least I'd get someone with physical access to it and more knowledge than us Internet randos to assess it.