you only need a pea size! I have extremly sensitive skin, i applied loads before ( thinking the more i apply on the quicker it will work. ) Such a bad choice!
The next day woke up with SOOOO flaky skin its unbeleiveable.
So massage a PEA SIZE into your acne prone area(s).
And leave! Do not pick or touch at them, also i wouldnt recommend putting make up on afterwards, Totally messes with your foundation/concealer etc.
Hope it helps.