Been using this since college. Potent benzoyl peroxide kills acne causing bacteria and helps with my inflamed cystic acne whenever it decides to show up, usually during my period. It is so strong it can even stain your clothes. It’s versatile as you can use it as a daily wash or a mask. Since my break outs are usually around my chin and forehead, this is where I apply it as a mask and spare my already dry cheeks. Holy grail acne mask right here.