Recently, actors Guo Xiaodong and Cheng Lisha sparked heated discussions after appearing on a variety show, with their remarks frequently trending on Weibo. In the latest episode, Cheng Lisha dropped another bombshell, claiming she had two cosmetic injections before filming, leaving her face so stiff she couldn't smile. Guo Xiaodong playfully teased her for "asking for trouble," adding that his wife looked perfectly fine naturally.
So, can cosmetic injections really cause facial stiffness and loss of smile?
First, let's examine what these injections actually are.
Currently, the mainstream injectable cosmetic materials in China are primarily hyaluronic acid and botulinum toxin. Both offer wrinkle reduction and anti-aging effects, while botulinum toxin also helps slim the face. To determine if either injection causes facial stiffness, let's look at them separately.
Botox
Botox is essentially a neurotoxin and one of the world's most potent toxins. Its medical aesthetic application leverages its nerve-paralyzing properties for wrinkle reduction and facial slimming.
Professor Jiang Ping, Deputy Director of the Plastic Surgery and Aesthetics Department at Nanfang Hospital of Southern Medical University, previously noted in an interview that the botulinum toxin used in medical aesthetics is diluted and administered in very small doses. When injected under the guidance of a qualified doctor at a reputable hospital, its safety is assured.
Regarding cases like Cheng Lisha's, where facial stiffness prevents smiling after injection, Professor Jiang Ping acknowledges this as a potential outcome. "Given botulinum toxin's inherent toxicity, improper dosage control or inadequate injection technique may cause facial muscle paralysis in patients. Specific manifestations include facial rigidity, unnatural smiles, and impaired expression control. Experienced practitioners can minimize such risks, and even if they occur, symptoms typically resolve naturally over time."
Hyaluronic Acid
Hyaluronic acid is a naturally occurring physiological component in the human body with excellent moisturizing properties. When injected into the face, its effects vary depending on the injection site and dosage. It can smooth out depressed wrinkles and provide facial volume enhancement. Common procedures include hyaluronic acid wrinkle reduction and rhinoplasty.
According to Professor Jiang Ping, since hyaluronic acid is a naturally occurring substance in the body, allergic reactions or rejection are rare as long as the product meets quality standards.
"Common side effects of hyaluronic acid injections primarily involve vascular embolism—where the filler blocks blood vessels—which in severe cases can lead to tissue necrosis or blindness. However, such incidents are typically associated with unlicensed clinics and non-professional practitioners."
Regarding facial stiffness, Professor Jiang clarified that this is not a side effect induced by hyaluronic acid. While excessive injection during filler procedures may cause over-plumping or a "plastic-like" appearance, it does not impair normal facial expressions like smiling.
Overall, injectable cosmetic treatments are safe and effective. Facial stiffness remains a low-probability occurrence. Seeking experienced plastic surgeons with strong aesthetic judgment can minimize such risks.