Metrogel suddenly stopped working??

I started using metrogel about a month ago, within about 10 days all my pustules had disappeared and new ones weren’t appearing, I was so excited! The general redness was fading too. Then yesterday morning I woke up with pustules again and today even more… I was clear for all of 2 weeks. What happened?! I didn’t change anything in my routine or start new products. So discouraged 😢