Alright so I started using azelaic acid 15% as a first and noticed how my comedones were starting to turn into white heads. I absolutely hate clogged pores and comedones, they come so fast and stay for the longest it's extremely annoying.
So I started with pea size amount and then a moisturizer (any, without any pore clogging Ingredients) 
Minimize your skincare routine, check your cleanser 
Yes you heard me right, cleansers that have pore clogging ingredients will do you so bad.
Keep the skincare minimal because you'll be using acids (BHA,AHA, LACTIC, GLYCOLIC, AZELAIC, RETINOL) 

be patient and hang in there :)

Got closed comedones that are stubborn?

Although it's written on the bottle as a daily use, I advice not to use acids daily especially AHA and BHA. Twice a week is good.

You guys, this toner was and still is a miracle. It's such a big bottle and you only need two to three drops. It's bas salicylic acid which is amazing for acne (white heads and black head) it gives you the most smoothest baby skin after you wake up. Make sure you're using it at night because in daylight salicylic acid ain't good, it's going to irritate your sensitive skin. 

MaryamK