What are the reactions after receiving facial slimming injections?

Generally, "face slimming injections" refer to injectable botulinum toxin type A. This treatment involves injecting botulinum toxin type A into the muscle tissue to block nerve impulses between nerves and muscles, thereby relaxing overactive muscles and achieving a slimmer facial appearance. The typical reference price for injectable botulinum toxin type A is 1,000–5,000 yuan per session. Noticeable improvements are usually seen within 1 to 3 months after treatment, although side effects such as swelling and pain may occur. Possible reactions following injection include weakened masseter muscles, local swelling, unnatural facial expressions, skin laxity, and allergic reactions. Specific details are as follows:

1. Weakened Masseter Muscles

The main component of injectable botulinum toxin type A is botulinum toxin, which acts on the masseter muscles, causing them to gradually atrophy. For a period after injection, individuals may experience weakness in the masseter muscles, such as reduced chewing strength, particularly noticeable when eating harder foods.

2. Local Swelling

Mild swelling at the injection site may occur, which is a normal bodily response to the injection. Typically, the swelling is mild and gradually subsides within a few days. If swelling is severe or persists for an extended period, medical attention should be sought promptly.

3. Unnatural Facial Expressions

If the dosage or injection site of botulinum toxin type A is inappropriate, it may affect other facial muscles, leading to unnatural facial expressions. For example, smiling may appear stiff, or asymmetry of the mouth corners may occur.

4. Skin Laxity

As the masseter muscles atrophy, the underlying support in the lower face may weaken. Individuals who already have relatively loose skin may notice mild skin laxity. This effect may be more pronounced in older individuals.

5. Allergic Reactions

A very small number of people may develop an allergic reaction to components in injectable botulinum toxin type A, manifesting as redness, swelling, itching, or rashes at the injection site. If an allergic reaction occurs, the treatment should be stopped immediately, and medical care should be sought promptly.

It is recommended to undergo this procedure at a reputable medical facility under the guidance of a qualified physician to ensure both effectiveness and safety. After the procedure, avoid massaging the injection area, refrain from eating hard foods, maintain facial hygiene, and closely monitor for any abnormal reactions.