In pine needle oils from various origins, over 255 chemicals have been identified. A full literature review of the qualitative and quantitative composition of commercial and non-commercial pine needle oils of various origins and their chemotypes has been published in 2016. Contact allergy to/allergic contact dermatitis from pine needle oil has been reported in 12 publications. Four positive patch test reactions to pine needle oil were seen in 200 (2.0%) consecutive patients with dermatitis. In a group of 51 patients allergic to Myroxylon pereirae resin (balsam of Peru) and/or turpentine and/or wood tar and/or colophony, there were 15 (29.4%) positive reactions to pine needle oil. In a number of publications, positive patch tests to pine needle oil have been reported with unknown, uncertain or unstated relevance. In Poland, 30% of patients allergic to turpentine oil also react to pine needle oil; a-pinene is the major ingredient of turpentine oil and also an important component of pine needle oil.