Most likely you have dirt trapped in the seal. I always use 35mm film to slide into the seal, all around the fork tube. It's worked for me every time. It could push dirt into your fork, so changing the oil isn't a bad idea after doing this a few times.
If it's not just dirt trapped in there it could be you need a shock rebuild. The seals do need replacing every once in a while. It isn't to hard to rebuild a shock too, I can give you some general instructions if you like.
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