Telangiectasias are small, dilated or broken blood vessels visible near the surface of the skin or mucous membranes. You may know them as spider veins. They typically appear as thin red, purple, or blue lines, often in clusters that branch outward like a web. While they’re usually harmless, they can sometimes signal an underlying health condition worth paying attention to.
What Happens in the Blood Vessels
Your skin contains a dense network of tiny blood vessels called capillaries. Normally these are too small to see with the naked eye. In telangiectasia, these vessels permanently widen, bringing them close enough to the skin’s surface to become visible. Unlike a bruise or temporary flushing, these dilated vessels don’t go away on their own once they’ve formed. The walls of the affected vessels have essentially lost their ability to contract back to normal size.
Where They Appear Most Often
Telangiectasias show up in predictable spots. A study of 106 patients published in JAMA Dermatology found that the face accounted for 37.2% of all telangiectasias, followed by the hands at 26.4% and the upper trunk at 17.1%. The lower limbs accounted for just 1.5% in that particular group, though leg spider veins are extremely common in the general population, particularly around the thighs and ankles.
On the face, they tend to cluster around the nose, cheeks, and chin. On the hands, they often appear along the inner surface of the fingers. There’s no definitive explanation for why these areas are more prone than others, though sun exposure and skin thickness likely play a role.
Common Causes
Several factors can trigger telangiectasias, and most people have more than one working against them:
- Sun exposure: UV radiation damages the walls of small blood vessels over time, making them more likely to dilate permanently. This is one of the biggest drivers of facial telangiectasias.
- Aging: Blood vessel walls naturally lose elasticity with age, making them more prone to stretching.
- Genetics: Some people inherit a tendency toward weaker vessel walls. If your parents had visible spider veins, your risk is higher.
- Pregnancy: Increased blood volume and hormonal shifts put extra pressure on small vessels, particularly in the legs and face.
- Varicose veins: When larger veins in the legs malfunction, the increased pressure can cause smaller surrounding vessels to dilate.
- Steroid cream overuse: Prolonged application of topical corticosteroids thins the skin and weakens blood vessel walls in the treated area.
- Trauma: Direct injury to the skin can damage capillaries enough to cause permanent dilation.
Medical Conditions Linked to Telangiectasia
In many cases, spider veins are purely cosmetic. But widespread or unusual telangiectasias can be a feature of specific diseases. Rosacea is one of the most common. The persistent facial redness that characterizes rosacea involves vascular changes, and visible telangiectasias on the cheeks and nose are a hallmark of the condition.
Systemic sclerosis (also called scleroderma) is a chronic autoimmune disease where telangiectasias are a core feature. They’re one of the five defining elements of what’s known as CREST syndrome, a subtype of the disease that also involves skin thickening and calcium deposits. In scleroderma patients, the number of telangiectasias on the hands and face tends to reflect the total body count, so doctors can use those two areas as a quick gauge of severity.
Hereditary hemorrhagic telangiectasia (HHT) is a genetic condition where abnormal blood vessels form throughout the body, including in the nose, lungs, liver, and brain. Unlike cosmetic spider veins, HHT can cause frequent nosebleeds, internal bleeding, and serious complications. Liver disease, particularly cirrhosis, can also cause characteristic spider-shaped telangiectasias on the upper body due to changes in how the liver processes hormones that affect blood vessels.
How It’s Diagnosed
Most telangiectasias are diagnosed by visual inspection alone. A dermatologist can often confirm the diagnosis during a standard skin exam. For cases where the type or cause is unclear, a handheld magnifying tool called a dermatoscope reveals the structure of the vessels in detail. Telangiectasias show distinctive patterns under magnification: red, tortuous capillaries arranged in a net-like formation. Different subtypes produce different patterns. Some conditions show small red oval pools of blood, while others display a branching, reticulated appearance.
If a doctor suspects an underlying condition like scleroderma or HHT, they’ll typically order blood tests or imaging to look for signs of systemic disease. The telangiectasias themselves don’t require a biopsy in most cases.
Treatment Options
Treatment isn’t medically necessary for most telangiectasias, but many people pursue it for cosmetic reasons. The two main approaches are laser therapy and sclerotherapy, and the best choice depends on where the vessels are.
For facial telangiectasias, pulsed dye laser is the standard. The laser targets the red pigment in blood, heating and collapsing the dilated vessel without damaging surrounding skin. Most people need 6 to 8 sessions spaced about 3 to 4 weeks apart, though larger or more widespread cases may require up to 12 sessions. In one case series, 71% of patients achieved excellent clearance (75% or more of the treated area improved), and the remaining 29% achieved moderate to good clearance. Results are typically evaluated about 6 months after the final session.
For leg telangiectasias, both laser and sclerotherapy (where a solution is injected into the vessel to close it off) work well. A prospective study comparing the two found no significant difference in effectiveness after three sessions. Patients rated both approaches similarly for vessel clearance, with mean satisfaction scores of 7.9 for laser and 7.0 for sclerotherapy on a 10-point scale. Sclerotherapy tends to be more common for larger leg veins, while laser is often preferred for very fine vessels or areas where injection is difficult.
Treated vessels don’t reopen, but new telangiectasias can form over time, especially if the underlying cause (sun exposure, rosacea, aging) continues.
Reducing Your Risk
You can’t prevent all telangiectasias, especially those driven by genetics or aging. But sun protection makes a meaningful difference for the face. A broad-spectrum sunscreen with at least SPF 30 is the baseline recommendation, and SPF 50 or higher is often advised for people with rosacea-prone or sensitive skin. Reapplying throughout the day matters more than the initial application.
If you’re prone to facial redness or flushing, identifying and avoiding your personal triggers helps reduce the vascular stress that leads to permanent dilation. Common triggers include alcohol, extreme temperatures, spicy food, and skincare products containing alcohol, menthol, peppermint, or eucalyptus oil. Keeping skin well moisturized also helps. Dry, compromised skin is more reactive, and a healthy moisture barrier reduces irritation that can worsen visible vessels over time.
For leg spider veins, maintaining a healthy weight, staying active, and avoiding prolonged standing or sitting can reduce the venous pressure that contributes to their formation. Compression stockings help for people who are on their feet for extended periods.