Do you mean this?
What operating system are you using?
Do you only see this with thew brush tool, and does it follow the cursor?
It looks like a stroke smoothing tool like Lazy Nezumi Pro, but it isn't Lazy Nezumi. If you are on a Mac, then it might be Hej Stylus. Do you have that installed? I don't recognize it as anything native to Photoshop.
If you mean the dashed lines, then that indicates a selection. Ctrl D will cancel out of it.
ohh yes that's it i didn't expect it would be that
i was looking every where on photoshop
thanks you so much i would never find it