Skin Booster Results and Aftercare: How Long Until You See Results, and What to Avoid After Injection

How long do skin boosters take to show results?

There is no standard number of days. The studies reviewed took their first measurement 1 month after the last injection, not in days. [2][4] The authors of a 2024 review also say standards for skin boosters still need to develop and objective measurement is hard, [1] so nobody can give a fixed number of days with evidence. [1][2][4]

In a randomized, evaluator-blind trial of a HA gel injected into the dermis of the cheeks, raters scored results 1 month after the last injection. 57.9% had cheek skin at least one grade smoother, against 4.5% of the untreated group, and the result held through 6 months of follow-up. [2] The manufacturer sponsored the study. [2]

Another randomized trial, of non-cross-linked HA in 55 women, injected one cheek with HA and the other with saline. An instrument-measured stiffness parameter (E1) fell 10.9% at 1 month and 10.5% at 3 months after the last injection versus baseline, which the authors read as better elasticity, but against the saline side the difference at 3 months did not reach statistical significance. [4] The manufacturer funded this study. [4]

What you see in the first week may therefore be redness, swelling or small bumps from the injection rather than the effect of the substance. [1][3] If you are unsure what face mesotherapy is, read [[meso-face-glow-vs-skin-booster]], and for choosing a substance read [[skin-booster-which-for-which-skin]].

What happens to the skin from the first hours to one month after injection?

Labelling and studies report redness, swelling, bumps and bruising early on. Most settle within 7 days, but some last longer. [1][3] The 2024 review says mild redness and swelling usually last a few hours after the procedure, with possible pain, bruising or needle marks. [1] Another source calls mild pain, redness, swelling and bruising common and expected short-term effects. [5]

The table summarizes the labelling of one US FDA-approved HA gel and the review. It is an overview, not a schedule for every substance. [1][3]

What should I avoid after skin booster injections?

The labelling of a US FDA-approved HA gel advises limiting strenuous exercise, strong sun, heat and alcohol during the first 24 hours. [3] There is no single list of restrictions for every substance, because substances and techniques differ, so the injecting doctor's advice comes first. [1][3]

The list below comes from one product's labelling and a review. Use it as sample questions for the doctor.

• Strenuous exercise, strong sun or heat in the first 24 hours, which can increase redness, swelling or itching at the injection site. [3]
• Alcohol in the first 24 hours; the labelling groups it with the two items above. [3]
• Applying makeup before asking; the labelling says to ask the doctor when it can be applied. [3]
• Laser, chemical peels or other planned procedures without telling the doctor, because of a possible inflammatory reaction at the site. The review suggests scheduling energy-based devices some weeks after booster injections, or doing them beforehand. [1][3]
• Taking aspirin, ibuprofen or blood thinners without telling the doctor, since bruising or bleeding at the site may increase. [3]
• Massaging, pressing or touching the area yourself. For some substances, such as PLA, protocols have the doctor ask for massage after injection, so do only what the doctor says. [1]
• Treating a lump or other problem yourself. The doctor chooses the remedy, such as medicines or an enzyme that dissolves HA. [1][3]

How long do skin booster results last?

Results are not permanent. One HA gel's labelling says results lasted 6 months in most participants, and repeat injections are usually needed to maintain them. [3] In the study group, 56% still had smoother cheek skin at 6 months, against 58% at 1 month, [3] which means the rest did not meet this study's measure of lasting improvement.

Duration differs by substance. The review reports a randomized trial of HA with glycerol that found hydration gains for up to 16 weeks in the group given multiple treatments, and up to 9 months after the last injection, especially in people with dry skin. [1] For PN, a European consensus cited in the review says effects typically last 6 to 12 months after a full course of treatment. [1]

In short, no single figure fits everyone. It depends on the substance, the person's skin and how the doctor injects. [1] The number and spacing of injections is the doctor's call, so this article does not state one. [3]

Which symptoms after injection mean calling the doctor?

The labelling says to call the doctor at once for vision changes, signs of a stroke, white skin or unusual pain during or soon after injection. [3] The reason is a very rare but serious risk, accidental injection into a blood vessel, which is reported to cause vision problems, blindness, stroke, scabs or permanent scarring. [3]

• Changes in vision. [3]
• Signs of a stroke, such as sudden trouble speaking, numbness or weakness in the face, arms or legs, trouble walking, a drooping face, severe headache, dizziness or confusion. [3]
• A white appearance of the skin in the treated area. [3]
• Unusual pain during or soon after the injection. [3]
• Significant pain away from the injection site. [3]
• Redness or visible swelling that lasts more than a few days. [3]
• Anything new weeks or months later, such as a lump or bump. In the study, 3 participants had lumps that went away on their own 12 to 15 months later. [3]

What should I check before injection to lower the risks afterwards?

Check that the product is registered with the Thai FDA, that a doctor injects it, and that sterile single-use equipment is used, because skin infections after aesthetic procedures are reported. [6][7] The Italian Society of Mesotherapy says the technique needs medical and pharmacological knowledge, disinfection rules, sterile single-use devices and a suitable setting. [7]

The Thai FDA warns against injecting cosmetic mesotherapy serums into the skin and advises checking the registration number before using a service. [6] To choose a substance and prepare questions for the doctor, read [[skin-booster-which-for-which-skin]], and to see how this differs from fillers read [[skin-booster-vs-filler]].