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Allergic reactions: A small percentage of people develop an allergic reaction to Botox. However, an allergic reaction to Botox is very rare. Symptoms can include redness, burning, itching and swelling at the injection site. If you experience a severe reaction after getting Botox and have trouble breathing, double vision, or trouble swallowing, contact your medical practitioner immediately and seek medical attention.
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Droopy eyelids: It's not uncommon for patients to develop droopy eyelids, also called ptosis, after getting Botox injections in their forehead area (glabellar). Apart from waiting, your medical practitioner can give you eyedrops to help with droopy eyelids or administer more Botox to counteract relaxed muscles. Droopy eyelids may negatively affect your confidence but will typically only last for four to six weeks.
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Dry mouth: Masseter treatment with Botox could potentially cause temporary dry mouth. It's unlikely to cause such a side effect if you had a treatment in the upper face. Side effects like this more commonly occur among men than women and usually last only a few days following treatment, according to the American Society of Plastic Surgeons (ASPS). If dry mouth continues beyond that point or becomes unbearable while it lasts then you may need additional medication like lip balm or throat lozenges until it goes away completely - but don't worry - this isn't permanent!