Looks like the seal on the strut is busted. I had an issue like this on a previous set of coilovers. Oil from inside the strut would leak out, accumulate dirt, and look nasty like that. I could hear clunking noises inside the cabin whenever I was going over bumps. You could either have the strut rebuilt or just replace it and move on. If it's a factory strut I'd recommend just having it replaced.
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