Final answer:
Injecting lateral canthal lines can lead to complications such as bruising, muscle weakness, facial asymmetry, ptosis, diplopia, and vascular occlusion. Patients should be treated by a knowledgeable professional to minimize risks.
Step-by-step explanation:
Injecting lateral canthal lines, commonly referred to as 'crow's feet', can lead to several complications. These treatments often involve the use of botulinum toxin or dermal fillers, which, if not correctly administered, can result in unintended side effects. Some of the likely complications include bruising at the injection site, muscle weakness, or asymmetry of facial features.
Furthermore, if the injected material spreads beyond the intended area, it can cause ptosis, which is drooping of the eyelid, or diplopia, which is double vision. Injecting too deep or into the wrong site may lead to a higher risk of vascular occlusion, which can cause skin necrosis or even more serious systemic effects.
Patients should be advised on these risks and be treated by a professional knowledgeable in facial anatomy. It's important to manage expectations and ensure that the correct techniques are used to minimize these potential complications.