Injecting Wegovy: What You Need to Know About Sites, Rotation, and Lumps

Wegovy is injected into subcutaneous fat — the tissue just beneath the skin. The abdomen (at least a few centimetres from the navel), the front and outer thigh, and the upper arm are the sites most commonly recommended in the patient information that comes with the pen. Your prescriber or doctor will advise on what is right for you, and the leaflet in your pack is always the definitive guide for technique.

Why rotation matters

Using the same spot repeatedly can cause a build-up of scar tissue under the skin, sometimes called lipohypertrophy. Rotating sites — moving to a different area or a different part of the same area each week — reduces that risk and helps the medicine absorb more consistently. Many people find it helpful to keep a simple record of which site they used and when, so rotation becomes automatic rather than something to remember.

Lumps after a Wegovy injection

A small lump, bump, or raised area at the injection site is one of the more commonly reported experiences on Wegovy, and is also something people frequently notice when injecting Mounjaro. In most cases these are mild, localised reactions — redness, swelling, or a small firm area under the skin — and they tend to settle within a few days. They are often linked to injecting into the same site repeatedly, injecting too quickly, or the pen not being at room temperature. Check the leaflet that came with your pen for specific guidance on preparation and administration, as manufacturer instructions can vary.

A broader look at lumps after a GLP-1 injection covers what is commonly reported and when to seek advice. If a lump is growing, is very painful, feels warm, shows signs of infection, or does not resolve after a few days, contact your healthcare professional promptly — do not wait.

For a wider overview of weight-loss injections, including how these medicines work and what the injection process generally involves, the hub page covers the full picture.

Keeping track of which site you used last week — and spotting patterns like a lump appearing after the same spot is used twice in a row — is exactly the kind of thing that is easy to forget and hard to reconstruct from memory. That is where the injection-site tracking in GLP Trackr is most useful.

Each time you inject, you can log the site (abdomen, thigh, or arm) alongside the date and dose strength. The app tracks your rotation history and suggests where to inject next, so you never have to guess or rely on mental notes. If you do notice a lump or skin reaction, the side-effect logging feature lets you record it with a timestamp — useful context to bring to your next prescriber appointment rather than trying to recall it weeks later.

You can also set a weekly dose reminder so your Wegovy schedule stays on track without needing to keep a separate calendar. It takes seconds to log, and over time the injection history builds into a clear record that is genuinely helpful when discussing your progress — or any concerns — with your prescriber or doctor. You can read more about how GLP-1 medicines work after an injection if you are curious about timing and what to expect.

If you experience any injection-site reactions that are severe, spreading, or not improving, always contact your healthcare professional rather than waiting. GLP Trackr helps you record what you are experiencing so you can describe it accurately — it is not a substitute for clinical advice.

Give the injection-site tracker a go — log your first site, let the app suggest your next rotation, and build a record that works for you. Available free on the App Store and Google Play, with a 7-day trial so you can explore everything before committing.