Stubborn pockets of fat—around the chin, jawline, under the jaw (submental area), or on small body areas—can be frustrating when diet and exercise haven’t shifted them. Fat-dissolving injections offer a minimally invasive option to reduce these localised fat deposits without surgery. This guide explains what fat-dissolving injections are, how they work, who is a suitable candidate, the treatment process, expected results, common side effects, aftercare, and realistic expectations to help inform decisions before booking a consultation.
What are fat-dissolving injections?
Fat-dissolving injections are pharmaceutical formulations injected into small, targeted fat deposits. They contain active ingredients that break down the membranes of fat cells, allowing the body to remove the released fatty material through natural metabolic processes. Products marketed under names such as Deso are used in aesthetic clinics to address areas of localised fat that are resistant to lifestyle changes.
How they work (simple explanation)
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Targeting: The clinician marks the treatment area where localised fat is present.
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Action: The injected solution interacts with fat cell membranes, helping them break down.
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Removal: Once fat cells are disrupted, the body’s natural inflammatory and lymphatic systems gradually clear the cellular debris.
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Result: Over weeks to months, the treated area becomes slimmer and more contoured.
Common ingredients (brief, cautious note)
Different brands use different formulations; many fat-dissolving preparations contain molecules that act locally on fat cells (for example, deoxycholic-type compounds are commonly used in similar products). Exact composition varies by brand—discuss ingredients and suitability with a clinician, particularly if there is a history of allergies or sensitivities.
Typical treatment areas
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Double chin / submental fat
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Small pockets on the jawline or cheeks
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Small body pockets, like under the arms or bra roll (in certain cases)
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Areas must be small and localised; large areas of fat are usually better treated surgically or via other body-contouring methods.
Who is a suitable candidate?
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Adults in good general health with realistic expectations.
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People with discrete, small pockets of fat that do not respond to diet/exercise.
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Not suitable if the fat area is large or if someone is significantly overweight—clinicians usually prefer BMI within a healthy range or advise on weight management first.
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Contraindications often include pregnancy, breastfeeding, certain infections at the treatment site, and specific medical conditions—an assessment is required.
The treatment process — step by step
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Consultation: Medical history, expectations, photography, and marking of target areas.
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Patch test or discussion of ingredients: If necessary, to check for sensitivity.
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Preparation: Skin cleaning and local anaesthesia or topical numbing may be applied for comfort.
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Injection: Multiple small injections are delivered across a grid pattern to cover the treatment area evenly. Sessions typically last 15–30 minutes depending on the area.
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Post-injection care: Ice packs, gentle massage if recommended, and aftercare instructions provided.
How many sessions are needed?
Most clients require a course of treatments—commonly 2–4 sessions spaced several weeks apart. The exact number depends on the amount of fat, the area treated, and individual response. Visible improvements often appear after 4–8 weeks, with full effect developing over several months.
Results and longevity
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Results are gradual and cumulative; fat reduction in the treated area tends to be long-lasting if overall body weight is maintained.
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As fat cells are physically reduced, treated areas often remain improved permanently unless significant weight is gained.
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Maintenance treatments are occasionally requested for fine-tuning.
Side effects and risks
Common temporary effects:
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Local swelling, bruising, redness and tenderness
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Firmness or lumps (usually an inflammatory process—resolve over weeks)
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Mild discomfort after treatment
Less common risks:
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Infection (rare with proper technique)
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Nerve injury (very rare; results usually transient)
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Irregular contour or asymmetry (can be minimised by proper technique and experienced providers)
Always discuss risks specific to the product and clinic protocols during the consultation.
Aftercare
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Apply ice intermittently for the first 24 hours to reduce swelling.
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Avoid strenuous exercise and alcohol for 24–48 hours if advised.
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Gentle massage may be recommended to encourage even distribution and lymphatic drainage—follow clinician’s instructions.
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Keep follow-up appointments to monitor results and plan additional sessions if required.
Combining with other treatments
Fat-dissolving injections may be used alongside complementary treatments—skin tightening procedures, dermal fillers for contour, or thread lifts—provided clinicians assess timing and compatibility. Combining modalities can produce more comprehensive facial or body contouring results.
Cost considerations
Pricing varies by area treated, number of sessions, and product used. Executive summary: expect a course cost rather than a single cheap session. Clinics typically provide a bespoke quote after assessment.
What to ask at your consultation
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Which product will be used, and what are its ingredients?
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How many sessions will likely be needed?
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What side effects should be expected, and how are complications managed?
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Are before/after photos available for the specific area?
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What is the total estimated cost, including follow-ups?
Frequently Asked Questions
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Are fat-dissolving injections permanent?
Treated fat cells are reduced permanently; however, remaining fat cells can expand if overall weight increases. Maintaining a stable weight helps preserve results. -
Do they hurt?
Discomfort varies. A topical anaesthetic or local anaesthetic can be used to improve comfort. Many clients describe a brief sting followed by soreness for a few days. -
How soon will I see results?
Initial improvement can show within 4–6 weeks, with progressive results over 8–12 weeks. Outcomes often follow multiple sessions. -
Is there downtime?
Most people return to normal activities the same day, though swelling and bruising can be visible for several days to weeks. Avoid strenuous exercise for 24–48 hours unless advised otherwise. -
Who should avoid these injections?
Pregnancy, breastfeeding, active infection at the site, and certain pre-existing conditions are common contraindications. Full medical screening during consultation is essential. -
Can fat-dissolving injections treat large body areas?
These injections are best for small, localised pockets. Larger areas usually require alternative methods such as liposuction or body-contouring technologies. -
What are the common side effects?
Swelling, bruising, firmness, and tenderness are common and usually settle in days to weeks. Discuss all risks with the treating clinician. -
Will insurance cover it?
Aesthetic treatments are typically self-paid. Check with the clinic for finance options or packages.
Call to action
For a personalised assessment and an honest discussion about whether fat-dissolving injections are appropriate, book a consultation with a qualified clinician. A face-to-face assessment will confirm candidacy and allow for a tailored treatment plan.