hello thanks for your reply.Hi Christina,
Acne breakout may not be entirely the fault of the whey protein you're taking. Typically for girls it could be hormonal, and the timing just happened to coincide with you taking protein.
i don't know if you have a history of acne, but you need to control the oil and breakouts, otherwise you risk getting dark spots that will take months and months to go away (PIH)
I suggest you start hydrating a lot more with fresh water (at least 2.5L per day)
and start using oil control products. I personally like sastid soap (available at all pharmacies) which has salicylic acid and sulpher, pat dry and apply a very low 2.5% benzoyl peroxide pimple cream, followed by a very light water-based moisturizer. Don't use anything with mineral oil or petroleum based products in your facial moisturizer!