1989 LMC Flow Lines

This is very common for Cents of the 80's. A raised area on a coin could be an indention of the die or a split in the plating. Yours looks like it could be die damage and die wear. You might wish to set it aside to see what other feel it is. Is there any indication of Machine Doubling on devices on either side? That may have also added to what the area in question is showing.

The dies suffered heavy die wear possible from the over polishing to remove die clashes. That reduces the devices on the die and eventually makes a line through the devices. This is only noted on the 80's coins. Something must have changed to prevent this from happening on the newer coins.
The lines in the area in question then are from die movment. The roughness of the outside edge of the die leaves these lines. Kind of like the Machine Doubling on the bottoms of this date:

In the roll that I have there are several with the same Machine Doubling. The movement created these that you see from the bottom of the devices.