Lotions News: Overuse of skin numbing creams can cause death: FDA People who use large amounts of skin-numbing creams and lotions, often in conjunction with cosmetic procedures, are at risk of irregular heartbeats, seizures and even death, U.S. health officials warned on Tuesday. Scented oils linked to breast growth in boys The lavender and tea tree oils found in some soaps, shampoos, hair gels and body lotions can produce enlarged breasts in boys, researchers reported on Wednesday.