Even though we’re typically fully-formed adults by the time we hit 21 (physically speaking, at least), our bodies won’t stop changing, and our hormones will power on.

As we enter our prime years for fertility, our progesterone and estrogen levels are at their peak, ebbing and flowing with our menstrual cycles.

This alone can lead to weight fluctuation, mood swings, and yes, acne — even if you’ve never experienced it before.

Scroll down to view the best products and treatments for acne.