Bruising After Sclerotherapy: What to Expect and When to Worry

Bruising after sclerotherapy is common

Sclerotherapy uses tiny injections to close unwanted veins, and some bruising afterwards is expected. If you are searching because your legs look purple, mottled or dotted with marks, you are not alone. Most of what people notice is part of the usual healing process rather than a complication.

This page focuses on what bruising after sclerotherapy looks like, how long it usually lasts, why spider veins can look worse at first and when to call your doctor. For day-by-day care, see sclerotherapy aftercare, and for the treatment itself, see sclerotherapy explained. Your own doctor’s instructions always come first, since they know what was treated.

What bruising after sclerotherapy looks like

Several appearances are common:

• Small bruises at injection points, where the needle passed through the skin. These can be a few millimetres to a few centimetres across.
• Streaks or patches following the line of treated veins, because blood and the closed vein are visible under the skin.
• Colour changes over time, from red or purple to green, yellow, and finally brown or faded skin as the body clears the blood pigment.
• Raised, itchy or red marks around injection sites, which often settle within hours to days.
• Firm, tender cords along larger treated veins, as the closed vein hardens before it is absorbed.

Bruising can look dramatic, especially in people with fair or thin skin, or if larger veins were treated. In people with darker skin tones, bruises can look brown or grey-purple rather than blue. Compression, walking and rest all help recovery.

How long does it last?

There is no single timeline, and it depends on the size of the veins, the number of sessions and your own healing. As a rough guide:

Bruising can be slower to fade on the lower legs and ankles, where gravity and slower circulation keep blood in the tissue longer.

Spider veins look worse after treatment: is that normal?

Often, yes. A very common worry is that spider veins look worse after sclerotherapy. In the first days and weeks, treated veins may look darker, redder or more prominent than before. There are a few reasons:

• The vein is closed but not yet absorbed. It stays visible while the body clears it.
• Bruising overlaps the treated area and hides the changes beneath.
• Tiny new red blood vessels, sometimes called matting, can occasionally appear around treated areas and usually fade over months.
• Swelling or irritation can add redness.

Final results are usually judged weeks to months after treatment, and some areas need a repeat session. If you are unsure, show your doctor at the follow-up appointment rather than judging at one week. If you want to know more about the condition, see spider veins and spider vein treatment.

Leg pain and bruising after vein ablation

Sclerotherapy can also be used as part of a larger plan, and many people have ablation for deeper veins. Leg pain after vein ablation is a related and common worry. After ablation:

• A pulling or tight sensation along the inner thigh or calf is common as the vein closes.
• Aching, mild swelling and some bruising often come in the first week or two.
• Walking, compression if advised and simple measures your doctor suggested usually ease it.
• Symptoms should be gradually improving, not climbing.

Details on what is typical are in vein ablation side effects and recovery after varicose vein treatment.

Things that support healing

These are general measures; follow your own instructions.

• Keep walking regularly, which supports blood flow.
• Wear compression stockings or bandages as advised. See the compression stockings guide.
• Avoid very hot baths, saunas and prolonged sun on treated areas for the period your doctor recommends, since heat can worsen bruising and pigment changes.
• Do not rub, scratch or pick treated areas.
• Protect treated skin from strong sun, which may deepen staining. This is a common concern in sunny climates such as Singapore and Southeast Asia.
• Keep follow-up appointments, since your doctor can check progress and release trapped blood if needed.

Avoid taking new tablets or supplements to treat bruising without checking with your doctor, particularly any that thin the blood.

Trapped blood and hard lumps

Sometimes a treated vein fills with dark, thickened blood that cannot drain away. People often call this trapped blood. It can look like a dark, firm bump and feel tender. It is usually harmless and tends to soften over time, but it can make bruising look worse and last longer. Doctors can sometimes release it with a tiny opening in the skin, which may speed up recovery, so mention any firm, dark lump at your review. Do not try to squeeze or puncture it yourself, which can cause infection or scarring.

Is bruising a sign of a problem?

Bruising by itself is usually not a sign of anything wrong. What matters more is the pattern. Bruising that is slowly fading, with pain that is gradually improving, is reassuring. Bruising that is spreading quickly, together with severe pain, heat, fever or marked swelling, is different and should be checked soon. If you take blood-thinning medicine or have a bleeding tendency, tell your doctor before treatment, since bruising can be more extensive.

When to see a doctor

Contact your treating doctor promptly if you notice:

• pain that is increasing rather than easing
• spreading redness, warmth or swelling, particularly with fever
• a hard, hot, very tender lump along a vein
• blistering, an open sore or skin that is turning dark or breaking down
• pain in the calf with swelling that does not settle
• an allergic-type reaction such as widespread rash or itching

Call 995 immediately if you have sudden chest pain, breathlessness or coughing blood, or if one leg suddenly becomes swollen, painful and warm. These can be signs of a blood clot and are emergencies. Read more about blood clot in leg symptoms.

This page is general information, not a diagnosis. If you are worried about how your legs look or feel after treatment, ask the doctor who treated you.

This article is general information, not personal medical advice. Please speak to a doctor about your own symptoms. How we create our content.