Lavender has been extensively used in herbalism. An infusion of lavender is claimed to soothe and heal insect bites. Bunches of lavender are also said to ward off insects. If applied to the temples, lavender oil is said to soothe headaches. Lavender is frequently used as an aid to sleep and relaxation: Seeds and flowers of the plant are added to pillows, and an infusion of three flowerheads added to a cup of boiling water are recommended as a soothing and relaxing bedtime drink. Lavender oil (or extract of Lavender) is claimed to heal acne when used diluted 1:10 with water, rosewater, or witch hazel; it is also used in the treatment of skin burns and inflammatory conditions (it is a traditional treatment for these in Iran). There is scientific evidence to support the effectiveness of some of these remedies, especially the anti-inflammatory effects, but they should be used with caution since lavender oil can also be a powerful allergen.
According to a 4 July 2006 article in the Washington Post [1], "A preliminary finding presented at the Endocrine Society's conference last month ... suggests that shampoos, soaps and body lotions containing ... lavender may cause hormonal imbalances and breast growth in young boys".