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@cagimaha
There should always be a bit of oil residue in a two stroke exhaust and depending on how it's been designed this may spray out of the end of the pipe onto the tyre. Especially with enduro/mx based bikes where a small bit oil won't make the blindest bit of difference to the amount of grip.
Can you post a photo of the oil both the leak and the tyre and explain where it's coming from? It may be that the pipe is full of oily gunge and just needs a de-coke with some caustic soda or it may be that the bike is over-oiling due to either incorrect oil pump/pre-mix settings or not being razzed up the revs enough.