Warning Signs After Filler — Explained Simply

A little bruising, tenderness and mild swelling is normal after filler and usually settles on its own. The signs below are different — they can point to a vascular occlusion, meaning the filler has blocked or compressed a blood vessel and the tissue beyond it isn’t getting enough blood. This is the most serious complication in filler medicine, and recognising it early makes a real difference to the outcome.

Pallor (unusual paleness)

If an area of skin turns noticeably whiter than the surrounding tissue right after injection, it can mean blood flow into that area has been cut off or reduced. This is often the earliest sign of a problem and is easy to miss if it isn’t compared side-by-side with the untreated side of the face.

Tingling, numbness or disproportionate pain

Pain that feels far more intense than the injection itself would explain — or unusual tingling or numbness — can indicate that a vessel is compressed or blocked. Pain that keeps building rather than easing over the following hour is a signal to get in touch rather than wait it out.

Livedo reticularis (a mottled, net-like pattern)

This is a lace-like or net-like pattern of reddish-purple discolouration on the skin. It happens when blood is still reaching some small vessels in the area but not flowing normally through others nearby, giving the skin an uneven, blotchy appearance rather than a uniform colour. It is a recognised early sign that circulation in the area is compromised.

Grouped blisters

If small blisters appear — particularly in clusters, a few hours to a couple of days after treatment — this suggests the skin has already been short of blood supply for some time. This stage needs urgent attention rather than home care.

Skin necrosis (skin tissue starting to die)

This is the most advanced stage, where the skin turns dusky, grey, dark blue or black because the tissue has been without adequate blood supply for too long. By this point some tissue damage may already be permanent, which is exactly why the earlier signs above should never be brushed off as “just bruising.”

If you notice any of these signs — pallor, disproportionate pain or tingling, a net-like mottled pattern, grouped blisters, or skin that looks like it is starting to break down — contact us immediately rather than waiting to see if it improves.

How We Assess a Suspected Complication

Every case is assessed individually. We take a full history of what was injected, when, where and how much, and examine the area for colour, temperature, capillary refill, tenderness and any signs of skin injury.

Where clinically appropriate, we use high-frequency ultrasound with Doppler to look directly at the treated area. Doppler ultrasound lets us see whether blood is actually flowing through the vessels near the injected filler, rather than relying on visual signs alone. It can help locate previously injected filler, identify fluid collections or inflammatory changes, and confirm whether a vessel is compressed — which guides exactly where and how much hyaluronidase is needed. Ultrasound adds valuable information, but it works alongside clinical judgement rather than replacing it; very small vessels are not always fully visualised.

How We Treat Vascular Complications

When a hyaluronic acid filler is responsible for a vascular occlusion, hyaluronidase is the mainstay of treatment, given promptly and reassessed repeatedly until blood flow is restored. The dose and injection pattern depend on the ultrasound findings, the product involved and how much time has passed since symptoms started — this is not a one-size-fits-all injection, and delayed or inadequate treatment is one of the main reasons outcomes can worsen.

For non-emergency concerns — unwanted filler, migration, overcorrection, or lumps and nodules — ultrasound assessment helps us confirm exactly where the product sits before deciding whether targeted dissolving, or a different approach entirely, is the right course. Not every lump should automatically be dissolved, and not every injectable responds to hyaluronidase — it will not dissolve biostimulatory fillers, permanent fillers, or your own fat.