Why do I keep getting pimples after I shave?

I always get pimples after I shave and now they are all over my face. They hurt too. What should I do? I'm using ultra sensitive shaving cream and a good razor. It seems like everytime I shave I get them. Could it be because of shaving or something else? I am 18 and it's never been a problem up until now.... show more I always get pimples after I shave and now they are all over my face. They hurt too. What should I do? I'm using ultra sensitive shaving cream and a good razor. It seems like everytime I shave I get them. Could it be because of shaving or something else? I am 18 and it's never been a problem up until now. My eating habits are good and sleep is good also. I'm wondering if hair gel and hair spray may cause pimples.
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