Bruising After Fat-Dissolving Injections: What to Know

A needle can break tiny vessels, leaving blood beneath the skin. The area may also be swollen, tender, firm, or mildly warm after treatment. Bruising can change colour as it settles and may be more noticeable in areas where the skin is thin. The product used, injection depth, and individual medicines or bleeding tendency can affect the appearance. Fat-dissolving injections commonly use [Deoxycholic Acid](/materials/deoxycholic-acid/), but your injector can confirm what was given.

Follow the treating clinician’s written instructions. Keep the injection sites clean, avoid rubbing or vigorous massage unless specifically advised, and use a cool pack wrapped in cloth for short periods if this was approved. Pause strenuous activity, alcohol, and non-prescribed medicines that can increase bleeding until your clinician says they are suitable. Do not apply unapproved creams or attempt to drain a bruise. Take photographs if the colour or swelling is changing so you can describe the pattern accurately.

Contact the injector promptly if swelling is rapidly increasing, pain is severe or escalating, the skin becomes pale or unusually dark, blisters appear, or the area feels cold or numb. Urgent help is needed for trouble breathing, facial swelling, difficulty swallowing, faintness, or widespread hives. Fever, spreading redness, pus, or worsening warmth can indicate infection. Ask whether [Fat Dissolving Injections](/treatments/injectables/fat-dissolving-injection/) or another approach such as [Cryolipolysis](/treatments/laser-and-energy/cryolipolysis/) fits your situation.

How extensive does this bruise appear? Which symptoms require same-day review? Should I change any medicine or activity temporarily? What product and dose were used, and when should the treated area be reassessed?