Venous lakes rarely disappear on their own. These small, dark blue or purple bumps form when a vein beneath the skin becomes permanently stretched and filled with pooled blood, and the structural changes that cause them don’t reverse naturally. The wall of the affected vessel develops a thick layer of fibrous tissue, which means the dilation tends to be permanent. If you want a venous lake gone, professional treatment is highly effective and usually takes just one session.
What a Venous Lake Actually Is
A venous lake is a soft, compressible, dark blue to violet papule caused by a dilated vein just below the surface of the skin. They most commonly appear on the lower lip, though they can also show up on the ears, face, and neck. The lesion is filled with slow-moving venous blood, which gives it that characteristic deep blue or purple color. If you press on it, it temporarily flattens and blanches before refilling.
Venous lakes are most common in people over 50 and occur more frequently in men than women. Under a microscope, the vein wall shows a single thin layer of cells on the inside surrounded by a thick cuff of fibrous tissue on the outside. That fibrous remodeling is key to understanding why these don’t shrink back to normal: the vessel wall has physically changed in a way that holds the dilation in place.
Why They Don’t Go Away on Their Own
Unlike a bruise or a temporarily swollen blood vessel, a venous lake involves permanent structural changes to the vein wall. The fibrous tissue that replaces the normal elastic tissue cannot contract and restore the vein to its original size. There are no documented cases of established venous lakes spontaneously resolving in the medical literature. They may fluctuate slightly in appearance, looking darker in cold weather or lighter when compressed, but the underlying lesion stays.
The encouraging news is that venous lakes are completely benign. They don’t transform into cancer or become more aggressive over time. For many people, the only concern is cosmetic.
What Causes Them
The exact mechanism isn’t fully understood, but chronic sun exposure is the leading suspected cause. Studies have found that people with venous lakes on the lips are significantly more likely to have signs of long-term sun damage, including precancerous sun spots on the skin. A history of sunburns during childhood or early adulthood also appears more common in people who develop these lesions. Smoking may play an additional role when the lesion forms on the lip, though the evidence is less clear. Aging itself weakens the support structures around small veins, which is why venous lakes almost exclusively affect older adults.
Treatment Options That Work
If a venous lake bothers you cosmetically or keeps getting bitten or irritated, several treatments can eliminate it. The most studied option is laser treatment, and the results are excellent.
In a study of 34 patients treated with a long-pulsed laser targeting the blood vessel, 94% achieved complete clearance after a single session. Only 6% had incomplete results and needed additional treatment. The laser works by delivering energy that the blood inside the vein absorbs, which heats and seals the vessel shut. The body then gradually reabsorbs the closed-off vein over the following weeks.
Recurrence rates vary somewhat depending on the type of laser used. Over a 12-month follow-up period, certain laser types showed no recurrence at all, while others had recurrence rates of roughly 8% to 11%. Even in those cases, a repeat session can address the returning lesion.
Sclerotherapy is another option, where a chemical agent is injected directly into the vein to cause it to collapse and scar shut. A study of 25 cases treated this way showed successful outcomes, though sclerotherapy generally carries a higher chance of temporary side effects like bruising and skin discoloration compared to laser treatment.
Cryotherapy (freezing) and surgical excision are also used, though they’re less common for lip lesions because they can leave more noticeable scarring in that area.
What Healing Looks Like After Treatment
After laser treatment, you can expect some swelling and tenderness at the site for a few days. The treated area often forms a small crust or scab that falls off within one to two weeks. The dark blue color fades as the sealed vein is reabsorbed, and the skin typically looks normal within a few weeks. Most people return to their usual routine the same day.
After sclerotherapy, the injected vein hardens temporarily before the body breaks it down. Some bruising and mild discoloration at the injection site is common and can take several weeks to fully fade.
How to Tell It Apart From Something Serious
The dark color of a venous lake can understandably worry people. The key distinguishing feature is compressibility: if you press on it and the color disappears momentarily, that strongly suggests pooled blood rather than pigment from a mole or melanoma.
Venous lakes are uniformly purple, red, or blue. Melanomas on the lip, which are rare, tend to be brown or black and often show multiple colors, asymmetry, irregular borders, or ulceration. A venous lake is soft and dome-shaped, while a melanoma is more likely to be flat or irregularly textured. Dermoscopy studies confirm that venous lakes almost never show the brown or gray coloration typical of melanotic lesions.
That said, if a lip lesion is firm, doesn’t compress, shows mixed colors, or changes rapidly, having a dermatologist examine it with dermoscopy can rule out anything concerning within minutes.