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Perhaps you rolled your edge when stropping?

Its hard to say really, could be your angles, technique etc.

Oh and just in case: when you are doing your first pass, for now just try going over...

Basically as little pressure on your face as possible, its not like a mock3 where you need to press real hard to get the desired shave.

+1 What Glen said.

You are just starting so some burning will be natural. From the very closeness you get from a straight and pressure. I would say wait a day or 2 before your next shave, just to...