I have been using benzoyl peroxide and erythromycin for quite a while now for acne. However, my skin gets dry in the winter and both medications are irritating my skin.
My doctor suggested only using one medication.
Which would you suggest? Which is more effective? Which will treat acne more quickly?
All help is appreciated. Thank you!

Also: Do you put it all over the areas where your face breaks out or just over current acne? How much do you apply?