Not only does rosemary essential oil relieve stress but it also has antiseptic qualities, which is why I put in in my creams. From Organic Facts:

Rosemary essential oil is not used in skin care as extensively as it is used in hair care, but it does have antimicrobial and antiseptic qualities that make it beneficial in efforts to eliminate eczema, dermatitis, oily skin, and acne. Topical application of the essential oil or a regular massage  with the oil helps in toning the skin and removing dryness. It can also  give your skin a healthy, even glow when regularly applied, or when it  is the main component of your moisturizers and other creams.  (Read more.)