Tire question

[Catrin]

The other day I examined the tires of both of my bikes for foreign objects - I did not expect to find anything else.

On one of my Trek's tires I noted a place that appears to have a small ridge up the center of the tire. That bike only has 325 miles on it - that couldn't be a cord starting to come through - could it? Am unsure what that looks like, but it looks different from the rest of the tire and it is not a foreign object.

I am clueless as to else what this might be, but figured someone here would have an idea - I do not think that it would photograph well though I can try it tonight if the description does not seem enough.

This "ridge" (for lack of a better word) is thin and straight and I can feel a slight rise with my finger and is about 4-5 inches long.

The tires are Bontrager Race Lite, 700x28.