Researchers have determined that lavender and tea tree oils can cause young boys to develop breasts.

They said their study, published in today’s issue of the New England Journal of Medicine, suggested these oils could act in ways similar to the hormone estrogen.

“This report raises an issue of concern, since lavender oil and tea tree oil are sold over the counter in their ‘pure’ form and are present in an increasing number of commercial products, including shampoos, hair gels, soaps, and body lotions,” the researchers wrote.

Fortunately, the enlarged breasts went away when the use of the oils was discontinued.

From what I can tell, men who are out of puberty should be able to safely continue using these oils, commonly found in shampoo, soaps, and other hygiene products, without much fear of tit swelling.