Scented Geranium is not one of the huge medicinal plants of the herb world, but it can be used safely for a few minor ailments.  The main medicinal property seems to be as an astringent, making a good choice for herbal facials and baths.  Make a bath by putting leaves and flowers in a mesh bag (or something similar) and hang under the tap water.  Make a Tea and leave unsweetened for steam facials and to wash the face.  Use with caution if you have sensitive skin, as in some people the essential oil causes mild rash. 

It is said that teas can also be used for treatment of stomach ulcers, and that steeping the leaves in vinegar, then applying to scalp and forehead will ease headache symptoms.