Is it ok to mix skin care treatments?

So I've had a horrible pimple for over a week now. My regular skin care treatment isn't helping at all. So I mixed up a bunch of stuff. I used moisturizer, acne cream, some vitamins that I mashed into a powder, and lemon juice (cause I read about its use as a natural remedy). Is it possible that it could damage my skin more. I haven't put it on my face yet. I'm just desperate to get this pimple off my face!
Is it ok to mix skin care treatments?
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