Thread Veins (Spider Veins)
Spider veins are tiny blood vessels that appear near the skin’s surface, where they can be easily seen. Doctors also call them thread veins, and adults commonly experience this vein condition. Although many people consider thread Veins only a cosmetic concern, research shows that they often indicate underlying venous problems that require careful assessment.
What Are Spider Veins?
Tiny blood vessels known as spider veins or sometimes thread veins, broken veins, venous flares, or surface veins reside within the dermis, the top layer of the skin. When these vessels dilate, they become visible as red, blue or purple lines. The dermis is usually 2–3 mm thick. Therefore, the deeper the vein lies within the skin, the fainter it appears, while more superficial veins look darker and more prominent.
Thread Veins are extremely common. Studies estimate that around 80% of adults will develop them at some stage of life. They occur equally in men and women, although women tend to seek treatment more often for cosmetic and symptomatic reasons.
Read More: How Do Veins Work
Where Do Spider Veins Appear?
These tiny vessels can appear in various areas, including both the face and the legs. On the face, they often appear on the cheeks, nose and chin. On the legs, people usually see them on the thighs, calves, and ankles. While they may look similar on the surface, there are significant differences between facial and leg Spider Veins that affect both diagnosis and treatment.
Differences Between Facial and Leg Spider Veins
Firstly, position relative to the heart plays a major role. Facial Spider Veins are located above the heart. Blood normally flows back to the heart with the help of gravity. Therefore, when facial Spider Veins remain open and visible, it suggests that arterial pressure may be contributing to their appearance.
In contrast, leg thread veins are positioned below the heart. They often remain filled with blood because of the column of venous pressure above them when a person stands or sits. For this reason, a simple surface treatment is rarely enough. At The Whiteley Clinic, specialists always perform a duplex ultrasound scan first to identify the source of the pressure and confirm whether deeper veins contribute to the problem.
Secondly, the skin itself shows clear differences. The environment constantly exposes facial skin. It adapts to sunlight, heat, and radiation, and its strong blood supply helps it heal quickly. The skin on the legs, however, usually remains covered and reacts more sensitively to heat and light.
It also has a poorer blood supply, which slows recovery. This difference explains why strong laser treatments that may be well tolerated on the face can sometimes cause permanent scarring on the legs.
Why Do Spider Veins Develop?
Spider Veins have several potential causes. Genetic predisposition plays a role, as venous weakness often runs in families. Hormonal factors, especially pregnancy and the use of hormonal treatments, can increase the risk. Prolonged standing or sitting, obesity and age are also contributing factors.
In the legs, underlying venous reflux links to most thread veins. In this condition, valves inside deeper veins fail, blood pools, and pressure increases in the surface vessels.
The importance of duplex ultrasound
A critical step in assessing thread veins is performing a duplex ultrasound scan. This test allows vein specialists to see beneath the skin, identifying whether reflux in deeper or perforator veins is driving the problem. Without this scan, treatment may only address the surface veins, which usually leads to recurrence. The Whiteley Clinic follows The Whiteley Protocol®, which places ultrasound scanning at the heart of every vein assessment. This ensures that treatment targets the root cause rather than just the visible veins.
👉Watch this short video to see why treating spider veins without identifying the underlying cause often leads to poor results.
Diagnosis at The Whiteley Clinic
At The Whiteley Clinic, specialists give every patient with spider veins a detailed consultation and duplex scan. The results show whether the visible veins are isolated surface issues or a sign of a more significant venous disorder. This personalised approach prevents ineffective treatments and reduces the risk of recurrence.
Treatment options for spider veins
Once the underlying cause has been confirmed, treatment can be tailored. On the face, options include gentle laser therapy or intense pulsed light (IPL), both of which target superficial vessels effectively while protecting the surrounding skin.
On the legs, specialists often treat thread veins with microsclerotherapy, injecting a sclerosant directly into the veins to close them. In some cases, they first use endovenous techniques such as laser or radiofrequency ablation to treat refluxing veins before performing microsclerotherapy.
Because leg skin heals more slowly, specialists take care to avoid overly aggressive laser treatment that could cause scarring. They individualise each treatment plan, balancing cosmetic results with medical safety.
👉Watch this video to see why microsclerotherapy often fails without a duplex ultrasound scan, and how hidden varicose veins can cause problems like matting.
Advances in understanding and treatment
Recent research has reinforced the link between Spider Veins and underlying venous reflux. To be truly effective, treatment needs to address more than just what’s visible on the skin. Modern protocols now combine imaging, minimally invasive endovenous procedures, and targeted microsclerotherapy to provide long-term results with minimal downtime. Advances in sclerosant foams, cooling technologies for facial lasers, and personalised treatment pathways have all improved safety and effectiveness.
Targeted treatment for lasting results
Spider Veins may appear minor, but they often signal hidden venous disease. Proper diagnosis with duplex ultrasound is essential to avoid recurrence and complications. At The Whiteley Clinic, patients benefit from a systematic approach that investigates, diagnoses and treats the true cause of thread veins, not just the visible lines on the skin.
By following The Whiteley Protocol®, specialists tailor treatments to each individual, ensuring safer procedures and better long-term outcomes.