Bunny lines are diagonal and vertical wrinkles that appear on the bridge of the nose and on either side of the nose with repeated contractions (squinting and laughing) of the nasalis muscle. Bunny lines cannot be found on everyone and are not universally disliked but some people dislike them and decide to treat them.
Bunny lines can also be the sign the frown area has already been treated with anti-wrinkle injections due to the compensatory movement after the treatment so if you are prone to developing these lines it can be beneficial treating bunny lines and frown lines at the same time.
Small doses of Botox are injected into the muscle on the nose sidewalls.