 [ Symptoms ] i have pneumonia was given augmentin clav 875 plus 5 day zpack this am big fever blister on top lip from illness [ Disease ] the best way to remove blackheads is to have a dermatologist do it they use a small instrument called a comedone extractor also retin a and differin are two potent anti blackhead comedolytic prescriptions available discs with glycolic and salicylic acid are also helpful in preventing comedones a k a blackheads from forming