Venous Lake: What Is That Blue Spot on Your Lip?
Have you ever noticed a small blue or purple spot on your lower lip that has been present for a long time? One possible cause is a condition called a venous lake.
Although the name may sound unusual, a venous lake is generally a benign vascular lesion and is usually harmless.
What is a Venous Lake?
A venous lake is a localized dilation of a small superficial vein (venule). Blood collects within this dilated venous space, giving the lesion its characteristic blue, purple, or dark violet appearance.
It is most commonly seen on the lower lip, although it can occur on other sun-exposed areas such as the ears and face.
The term “lake” is descriptive—it refers to the reservoir-like space of slowly flowing blood within the dilated vein.
Why Does It Occur?
The exact cause is not always clear. However, venous lakes are associated with:
- Increasing age
- Age-related weakening and dilation of superficial venous walls
- Chronic sun exposure
- Smoking
- Repeated local trauma or irritation
They are more common in middle-aged and older adults.
What Does a Venous Lake Look Like?
Typically, it appears as:
- Colour- dark blue, purple, or violet spot or small raised lesion
- Site - lower lip
- Shape - round or oval
- Surface- smooth or done shaped
- Borders - well defined
- Size - 2-10mm
- Consistency- soft and compressible
- Temperature - Normal
- Pulsation- absent
- Painless
- Sometimes becomes less visible when pressure is applied
One useful clinical feature is that the lesion may empty or blanch on compression and then refill after the pressure is released.
Diascopy
A transparent glass slide or clear plastic instrument is pressed gently against the lesion.
-
Blanching / fading on pressure → positive diascopy
- Blood is displaced from the superficial vessels.
- Suggests a vascular lesion such as a venous lake or hemangioma.
-
No blanching → negative diascopy
- Blood is not being displaced from the lesion.
- May suggest extravasated blood (purpura), pigmentation, or another non-compressible lesion.
Differential Diagnosis
Usually, no.
A venous lake can remain unchanged for many years. It may slowly become more noticeable with age, but spontaneous complete disappearance is uncommon.
If it is not causing any symptoms or cosmetic concern, treatment is usually not necessary.
Is It Dangerous?
A Venous lake is benign and does not usually pose a health risk.
Can It Be Treated?
Treatment is generally considered only when there is:
- A cosmetic concern
- Recurrent bleeding
- Repeated trauma or irritation
- Uncertainty about the diagnosis
Depending on the lesion, treatment options may include laser therapy, sclerotherapy, electrocautery, cryotherapy, or surgical removal.
When Should You Get It Checked?
See your dentist or doctor if a blue or purple lesion:
- Is new or rapidly enlarging
- Changes in colour or appearance
- Becomes hard or painful
- Develops an ulcer
- Bleeds repeatedly
- Does not behave like a typical compressible vascular lesion
Not every blue spot is a venous lake, however. A proper clinical examination is important for an accurate diagnosis.
BY,
DR.RENJU THANKOM GEORGE,
INDIA
