Tretinoin
"This is amazing. I have used it for 2 weeks and I'm shocked at how nice my skin looks. I haven't had to wear any concealer! I have fair, extremely sensitive skin and I think most of the horrible reactions people are getting from this are due to the person not using it correctly. At night after I wash my face I wait 20 mins so my skin is dry and has calmed down, and then apply a tiny amount of the cream to my problem areas (cheeks, nose, chin, around my mouth, forehead). You do NOT want to slather this stuff like benzoyl peroxide and you don't want to put it on a wet, inflamed face...then yes it will sting and burn."