How do I repair carpeting that is pulling out at the seam area?

The carpet is in great shape, it is over 20 years old, except for the seam area of the carpet ( sorry I do not have any pictures to show, I have not mastered that yet ). I have been looking for any small carpet mat to match the color the carpet, and then to cut some pieces off to glue into this area. I am still looking for a match,
Any ideas?

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