Erythromycin is a drug classified into Biopharmaceutical Classification System (BCS) class II which has low solubility in water so that it can reduce the speed of drug penetration into skin. One of the efforts to increase the penetration of Erythromycin is to formulate erythromycin into a nanoemulsion delivery system. The nanoemulsion was prepared by the PIT (Phase Transition Temperature) metho…