Just because you see something online for shave oil that contains tea tree oil does not mean that:

a) you should buy a bottle of tea tree oil at Whole Foods just because it happens to be near the shaving products.
b) you should rub 5-10 drops into your face
c) you should not read the instructions on the bottle before doing step b, which would tell you to put one drop on a damp cotton ball, and NEVER PUT IT UNDILUTED ON YOUR FACE!

Ow! Owowowowowowowowowow!!!