Help figuring out what is leaking from my car?

I have a 2011 Ford F150 that recently started leaking some sort of fluid. It started about a week ago and has been getting slowly worse. Before I take it to the mechanic I just want to figure out what it is.

It produces 1 small drip once every 30 minutes or so.

It appears to me to be grey in color which is why i'm having problems figuring it out.

The leak is under the engine, next to the driver side wheel near the suspension.

In the picture the left is a drip that I smeared with my hand and the right is a fresh drip.

Any ideas?

Thanks

Added (1). Update: All fluids have been checked and none are low. Help figuring out what is leaking from my car

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