I thought niacinamide was good for everything, but since I started using it, I’ve developed huge pimples on my chin that just won’t go away. They said it could cause vomiting, but it’s been two months; is it normal for it to still be continuing, or did the product not agree with me? Honestly, I can’t figure it out. Is there anyone here who’s experienced this or improved after stopping? I’m really exhausted; my skin is practically rebelling.