Acne from tomatoes!

I just started my period today, and I don't usually get acne during, but earlier this week, I broke out horribly! Even in my scalp! While nursing my cramps, my mom mentioned that her sister (post-menopausal) got a terrible breakout from eating tomatoes. I've been eating tomato salads for three days for lunch and now, I'm paying! Anyone else had similar from any other triggers?