Clove essential oil is toxic to the bacteria that most often contributes to symptoms of acne vulgaris, Propionibacterium acnes (P. acnes). However, it is not clear whether topical application of clove essential oil, is sufficient to inhibit the growth of P. acnes bacteria that are growing deep within follicles.
In laboratory tests, clove essential oil showed a similar level of antibacterial activity against P. acnes bacteria as erythromycin, which is a commonly used topical antibiotic in acne treatment.
Clove essential oil can be irritating to the skin when applied without dilution. It is usually diluted into a carrier oil or blended with other essential oils prior to application. Some people have an allergic response to clove essential oil.