It looks to me like your oil filter cap could be leaking. They may have not have put the o-ring on properly when they tightened it down. Or - they were just messy when they changed the oil filter and those pellets are dried out / coked oil that dripped when they changed the filter.
Regardless I would clean up the area with paper towel and make sure no further oil collects there. If it does, take your car back to the dealer, have them replace the filter cap o-ring and retorque the oil filter cover.
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