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Well, speaking as someone who had severe cystic acne for about 20 years (and can therefore not wear anything as revealing as a costume bra alone), I might suggest you get yourself to a dermatologist. He/she should be able to diagnose the type of acne you're dealing with and the proper treatment.
It's certainly possible that the change in your foundation is the culprit, or the manner in which you wash your face, but neither of those issues would apply to the acne on your back. It sounds like something systemic, rather than superficial, and I'd hie myself to yon doctor for a look-see.
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