Venous Lake on the Lip: What Is That Blue Spot, and Should You Worry?

What Is a Venous Lake?

A venous lake is a benign vascular lesion: a dilated small vein sitting very close to the skin surface. It appears as a soft, dark blue-purple spot or bump, usually a few millimeters in size. The most common location is the lower lip, but it can also appear on the ears and elsewhere on the face.

Venous lakes are most common after age 50, and many people live with one for years: some out of habit, others with a quiet worry that something is wrong.

“Every new dark spot on the lip gets a dermoscopic examination in my clinic before we discuss any treatment. Once we have confirmed it is a venous lake, the laser treatment is short and simple, and most patients are surprised to discover how many years they lived with something that was solved in minutes.”

Why the Lower Lip?

The main driver is cumulative sun exposure. The lower lip protrudes and catches direct radiation for decades, and that radiation gradually weakens the walls of small blood vessels. At some point the small vein dilates, forming a little "lake" of blood just under the surface. Under the Israeli sun this is common, for the same reason that skin cancer is especially common in Israel.

An important distinction: a venous lake is a result of sun damage, but it is not cancer and does not become cancer.

The Question That Really Matters: How Do We Know It Is Not Melanoma?

This is why such a lesion deserves a dermatologist's examination, even when it turns out to be entirely benign. A dark lesion on the lip shares its differential diagnosis with conditions that require completely different treatment, including melanoma, a labial melanotic macule, and other lesions.

In the clinic, the distinction is usually quick and straightforward:

When in doubt, a sample is taken for pathology. That is the advantage of seeing a dermatologist who performs both the diagnosis and the treatment: in most cases the question is settled in the same visit.

Treatment: A Short Laser Session

Once the diagnosis is clear, treating a venous lake is a choice: if it does not bother you, it can simply be left alone. The common reasons to treat are appearance, and repeated bleeding from a lesion that is easily injured while eating or shaving.

The most effective treatment is laser. In a published series of 34 venous lakes treated with a long-pulsed Nd:YAG laser, 94% cleared completely after a single treatment, with no reported complications. The procedure itself takes a few minutes, usually with light local anesthesia or none at all.

After treatment, expect mild swelling and sometimes a small crust that clears within days to about two weeks. One session is usually enough; occasionally a second session completes the result.

Alternatives exist, including diode laser, sclerotherapy, and surgical excision. Excision is reserved mainly for cases with diagnostic doubt, so the tissue can be sent for pathology.

A Case from the Clinic

I recently treated a patient with a typical blue-purple lesion on the lower lip. After the diagnosis was confirmed by dermoscopy, a short laser treatment was performed, and the lip returned to a smooth, even appearance. The before and after photographs, published with her consent, can be seen in our photo gallery, under "Angiomas & Vascular Lesions".

When Should You Get Checked?

The examination is short and painless, and in most cases you leave with a clear answer the same visit. You can book a skin examination at the clinic in Petah Tikva.

Summary

A venous lake is one of the most common benign lesions of older age, and the news is doubly good: there is no reason to worry once the diagnosis is confirmed, and no reason to live with the lesion if it bothers you. Telling it apart from dangerous lesions takes a simple in-clinic examination, and treatment, when chosen, is quick and effective.