Botox, known as the perfect solution to get rid of signs of ageing, can actually cause extra wrinkles.
Botox is a toxin injected under the skin, which paralyses facial muscles, smoothing lines and wrinkles.
Dr Becker, an assistant professor of dermatology at Weill Cornell Medical College in New York, suggested that muscle groups that have not been injected with Botox will still find a way to make expressions, leading to more lines.
"Paralysis of a set of muscles might lead to recruitment of other muscle groups in an attempt to reproduce the conditioned activity being blocked - resulting in more prominent muscle activity in adjacent regions," News.com.au quoted Becker as ssaying.
Women who have had Botox injections typically have lines across the bridge of the nose.
Celebrities Amanda Holden, Kylie Minogue, and Dannii Minogue reportedly have these lines.
The study has been published in The Journal of Cosmetic Dermatology.