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Tea tree oil is a popular ingredient in many over-the-counter healthcare and cosmetic products. With the explosion of the natural and alternative medicine industry, more and more people are using products containing tea tree oil. This article reviews basic information about tea tree oil and contact allergy, including sources of tea tree oil, chemical composition, potential cross reactions, reported cases of allergic contact dermatitis, allergenic compounds in tea tree oil, practical patch testing information, and preventive measures.

Bacitracin is an antibiotic widely used by both the medical profession and the general public. It is most commonly found in a variety of topical ointments and creams used after surgical procedures, for acute skin injuries, and for chronic wounds. The incidence of allergy to this agent has been increasing over the last 10 years, probably because of more frequent use. This article reviews basic information about bacitracin as an allergen, including sources of exposure, chemical composition, types of allergic reactions, and patch testing.