First time Proactive User?

Okay. So I just bought this product on Sunday and began using it since then. So it's basically been three days, and I use the product only once a day as recommended by the sales person. But just yesterday my face got really itchy in this one area on my chin. Everything else is just dandy and a little flaky here and there but that one spot is really itchy. Should I stop using it or just tough it out?