What Thread Veins Look Like After Laser: Bruising, Darkening and Fading

In short: after laser for thread veins, the most commonly described changes are redness and swelling in the first hours or days, and, with some lasers, purple bruising that fades over roughly one to two weeks. Some people get scabbing or a small risk of pigment change. The veins themselves are described as fading more slowly, over weeks to a few months, and often need more than one session. Exact timings depend on the laser, the settings and the vessel, so your practitioner will confirm what to expect for you.

Information below was checked against NHS hospital laser services and other published sources on 6 November 2026. It is general information, not a diagnosis, and it cannot predict how your own skin will respond.

Why the skin can look worse before the veins look better

Vascular lasers work by being absorbed by the blood in a small vessel. Depending on the device and settings, that can leave visible marking in the treated area. Bristol's NHS laser centre describes the pulsed dye laser as leaving "purple bruising after treatment for about a week", whereas the long-pulsed Nd:YAG laser may leave skin "a little sore, red", with some people getting crusting "for a few days". So two people treated with different lasers can have quite different first weeks.

A rough timeline from published sources

These are ranges quoted by different services, not promises. Where sources disagree, the table shows the spread.

When	What is commonly described	Source examples
First hours	Warmth, redness, swelling; some stinging like mild sunburn	Salisbury NHS laser clinic (warm and swollen for several hours); Chelsea and Westminster NHS (warm, looks bruised like mild sunburn)
First 1–3 days	Bruising may appear or darken; blistering is possible in some cases	Rotherham NHS leaflet (bruising "often darkens for up to 3 days"); Chelsea and Westminster NHS (bruising and possibly blistering over days 1–3)
About 1–2 weeks	Treated spots or bruises fade	Salisbury NHS (dark circular bruises "fade over 1 - 2 weeks"); Rotherham NHS leaflet (about 14 days, longer in some cases)
Several weeks	Lingering bruising or redness in some people; Chelsea and Westminster says fading "normal... to take several weeks"; one US academic centre says bruising may persist up to 6 weeks	Chelsea and Westminster NHS; UF Health
2–3 months	Treated area may "continue to improve"; repeat sessions are often spaced 2–3 months apart	Salisbury NHS laser clinic

Other providers quote faster vein clearance (for example 6–8 weeks, or "within two months"), and larger veins are described as slower. Treat all of these as ranges rather than a schedule.

The three things people mean by "darkening"

"Darker" after laser can describe three different things. Telling them apart helps you describe it to your practitioner.

1. Bruising that deepens in the first days. Rotherham NHS says bruising "often darkens for up to 3 days after treatment" before fading. This is a described normal course for pulsed dye laser purpura, not a sign of a problem by itself.
2. Crusts or scabs. Some NHS pages describe scabbing or blistering in treated areas. They advise leaving scabs to fall off naturally. Picking can increase the chance of marking, so avoid picking at darkened, loose or flaking skin.
3. A change in skin colour that lasts after the bruise has gone. Hospital leaflets list a "small risk of changes in pigmentation or colour" (Chelsea and Westminster) and say hyper- or hypopigmentation may occur, with hypopigmentation sometimes permanent (Rotherham). The sources we could open give no frequency figure, so we do not quote one. Sun protection on the treated area is advised in the leaflets; one NHS trust advises sun block for six months, so ask your practitioner what applies to you.

If a dark mark is still there well after bruising would be expected to have faded, mention it at review rather than trying to treat it yourself. Our related article on pigmentation darker after laser covers healing changes and post-inflammatory hyperpigmentation in more depth.

When the veins themselves fade

Fading is gradual. NHS Salisbury says the treated area may keep improving over 2–3 months and that multiple treatments are often needed, although some small marks may need only one. Bristol says several sessions may be needed for best results. Private providers quote ranges from a few weeks for small veins to 3–4 months for larger ones; these are provider statements rather than trial data.

Two practical points follow:

• Judge results after the bruising has gone and enough weeks have passed, not in the first few days.
• Veins that fade can be followed by new ones appearing later, which is why a maintenance conversation is part of consultation.

What helps and what to avoid, in general terms

Published aftercare themes are consistent: protect the area from sun, avoid heat and strenuous activity while it settles, keep it cool and moisturised as advised, and leave scabs alone. NHS leaflets differ on details such as make-up timing and how long to use sun block, so follow the written aftercare from the clinic that treated you rather than a general list.

When to contact your practitioner

Contact the clinic that treated you if you are worried at any point, in particular if:

• blistering or scabbing is more than you were told to expect;
• the area looks infected (spreading redness, heat, pus or increasing pain), since NHS leaflets say infection may need antibiotics;
• bruising or colour change is not settling in the time you were advised;
• you feel unwell. If you cannot reach the clinic and are seriously worried, use NHS 111 or your GP.

Treatment at Progen

Progen treats thread veins and some other small vascular marks with the Candela GentleMax Pro Plus laser after a consultation to check suitability. Your practitioner will explain which setting is planned, what marking is likely for you, what aftercare applies and how many sessions may be suggested. No particular outcome is guaranteed. You can read the Progen vascular lesions treatment page for preparation and aftercare information, or see prices and contact the clinic to arrange a consultation.

If your concern is facial redness rather than distinct vessels, see our comparison of facial thread veins and rosacea.

Frequently asked questions

How long does bruising last after laser for thread veins?

Published NHS sources describe purple bruising from pulsed dye laser lasting about a week (Bristol), 1–2 weeks (Salisbury) or around 14 days and sometimes longer (Rotherham). Chelsea and Westminster says fading can take several weeks. Your practitioner will confirm what to expect for the laser and settings used.

Is it normal for the treated area to look darker a few days after laser?

One NHS leaflet says bruising often darkens for up to 3 days after pulsed dye laser treatment before fading. Scabs can also look dark. A colour change that remains after the bruise has gone should be mentioned to your practitioner.

Should I pick the scabs?

No. NHS pages advise leaving scabs to fall off naturally, and Progen's aftercare guidance asks you not to pick or pull darkened, loose or exfoliating skin.

When will I see the thread veins fade?

Sources describe gradual fading over weeks to a few months, with larger veins slower. Salisbury NHS says the area may keep improving over 2–3 months. Several sessions are often needed, and results cannot be guaranteed.

Can pigment changes be permanent?

Hospital leaflets list pigment change as a risk after vascular laser. Rotherham NHS says hypopigmentation can be permanent. No frequency figure was found in the sources we could open, so ask your practitioner about risk for your skin type.

Read about laser treatment for thread veins and small vessels at Progen

Sources and further information

• PDL leaves purple bruising for about a week; long-pulsed Nd:YAG may leave soreness, redness and crusting for a few days; several sessions may be needed; sun block advised. Accessed 6 Nov 2026.
• Dark circular bruises 5–10 mm fade over 1–2 weeks; area may continue to improve over 2–3 months; treatments usually 2–3 months apart; multiple treatments often needed; warm and swollen for several hours. Accessed 6 Nov 2026.
• Bruising and possibly blistering over days 1–3; leave scabs; fading takes several weeks; small risk of pigment change; repeat sessions at least 12 weeks apart; sun block at least 6 months. Accessed 6 Nov 2026.
• Bruising lasts about 14 days, sometimes longer, often darkens up to 3 days; scabbing/blistering possible; hypo or hyperpigmentation may occur and hypopigmentation can be permanent; infection may need antibiotics. Accessed 6 Nov 2026.
• Bruising may persist up to 6 weeks; veins fade 6–8 weeks; risks include blisters, hyper- and hypopigmentation. Accessed 6 Nov 2026.
• Larger veins can take several weeks to fade; most people need 1–6 sessions; sun protection advised. Accessed 6 Nov 2026.
• Thread veins generally disappear within two months; all options need more than one session for best results. Accessed 6 Nov 2026.