Can vegetarianism cause skin outbreaks?

I've been eating vegetarian for 6 months, do you think lack of something found in meat is the reason for my skin outbreaks?

Or may tofu give such problems?

I've noticed these outbreaks before, I was a part time vegetarian (without tofu or Quorn, I just skipped meat), and I didn't have pimples the month around like I do now when being a full-time vegetarian.