[ppbon]

On the passenger side rear, the only thing you could have damaged that would ooze some oily fluid (in yellow) is the A/C lines.
The air conditioning lines run down from the engine and under the passenger's doorsill from the rear tire to the front radiators.
They are fairly vulnerable and running over a curb can certainly pinch and break one or both.
The yellow color is probably UV dye for tracing leaks.
You can easily tell if this is the problem by looking under the car immediately in front of the right rear tire. You should see the pinched line and oily discharge.
If your car is lowered and you don't have a way to lift it so that you can check vidsually, lay a mirror on the ground, under the described location and you will see both lines. The damage should be apparent.
If that's the case the damaged line(s) must be replaced and the A/C system needs to be recharged with refrigerant.
If you are using the car, make sure the A/C compressor is off (snowflake on the display) otherwise damage to the compressor will occur.
Happy Boxstering,
Pedro