Allergen. Citronella Fragrance was the American Contact Dermatitis Society (ACDS)’s Contact Allergen of the Year for 2007, and fragrance mix (which contains geraniol, which is in citronella oil) is a standard addition in patch test trays because it is such a common contact allergen. Often used as an a natural mosquito repellent option, citronella itself (a cousin of …
