Telangiectasias are small, visible blood vessels that sit near the surface of the skin or mucous membranes, appearing as fine red, purple, or blue lines or clusters. They form when tiny vessels dilate permanently and become wide enough to see with the naked eye. The term comes from the Greek roots telos (end), angeion (vessel), and ektasis (stretching), so the word literally means “stretched-out end-vessels.” While many people encounter telangiectasias as a cosmetic nuisance on the nose or cheeks, they can also signal underlying conditions ranging from chronic sun damage to inherited bleeding disorders.
What the Vessels Actually Look Like Under a Microscope
Telangiectasias can involve different types of small blood vessels: venules, capillaries, or arterioles. To the naked eye they all look like thin colored lines or web-like patterns, but under magnification the distinctions matter. In skin-surface telangiectasias studied in conditions like systemic sclerosis, the dilated vessels are postcapillary venules sitting in the upper layers of the skin.1PubMed. Histopathological and ultrastructural features of dermal telangiectasias in systemic sclerosis A broader clinical definition describes them as prominent small vessels, whether venules, capillaries, or arterioles, that show up as small red-purple focal lesions on skin and mucous membranes.2Elsevier / European Paediatric Neurology Society (Eur J Paediatr Neurol). Telangiectasias: Small lesions referring to serious disorders
Regardless of the vessel type, all telangiectasias share a common feature: the vessel wall has lost its ability to contract back to its normal diameter. The result is a permanently widened channel close to the skin surface, filled with blood that gives it its characteristic color. Red telangiectasias tend to involve arterioles and capillaries carrying oxygenated blood, while blue or purple ones are usually dilated venules carrying deoxygenated blood.
Common Causes and Risk Factors
The most frequent culprit behind facial telangiectasias is years of cumulative sun exposure. Ultraviolet radiation damages DNA in skin cells and generates reactive oxygen species that degrade collagen and elastin in the dermis. When the connective tissue scaffolding that supports small blood vessels breaks down, those vessels lose structural support and widen. Sun damage can also produce a constellation of other skin changes including wrinkling, irregular pigmentation, and precancerous growths.3PubMed. Chronic actinic damage of facial skin
A large cross-sectional study identified several measurable risk factors for facial telangiectasias. Older age, female sex, current or former smoking, high susceptibility to sunburn, and lighter skin color all independently predicted more extensive telangiectasias. Current smokers had roughly 38% more facial telangiectasia coverage than people who had never smoked, and people with pale skin had about 31% more than those with olive complexions.4PubMed. Epidemiology and determinants of facial telangiectasia: a cross-sectional study Smoking likely contributes by damaging blood vessel walls and impairing circulation, compounding the effects of UV exposure.
Pregnancy and hormonal changes can also trigger or worsen telangiectasias. Rising estrogen levels cause blood vessels to relax and dilate, which is why some pregnant women develop new visible vessels on the face, chest, or legs. These often improve after delivery, though not always completely. Topical corticosteroids applied to the face over weeks or months are another well-known trigger. Steroids thin the skin and degrade its collagen structure, eventually producing a rosacea-like appearance with prominent telangiectasias that can persist long after the steroid is discontinued.5PubMed Central. Steroid-induced rosacea: a clinical study of 200 patients
Telangiectasias and Rosacea
Rosacea is one of the most common conditions associated with facial telangiectasias. The redness that people with rosacea experience is not just flushing that comes and goes. Over time, the blood vessels in the central face undergo permanent structural changes, producing fixed erythema (persistent redness) along with visible telangiectasias.6PubMed Central. Advances in understanding and managing rosacea: part 1: connecting the dots between pathophysiological mechanisms and common clinical features of rosacea with emphasis on vascular changes and facial erythema The underlying vascular abnormality in rosacea is thought to be present from the start, and external triggers like climate, UV exposure, and the skin’s microbial flora push the superficial blood vessels further toward permanent dilation.7PubMed. Pathophysiology of rosacea: redness, telangiectasia, and rosacea
This is worth understanding because people often think the telangiectasias on their cheeks are simply a cosmetic consequence of aging or sun damage, when they may actually reflect an underlying rosacea diagnosis. The distinction matters because rosacea-related telangiectasias tend to worsen without treatment of the broader condition, and lifestyle modifications like avoiding known triggers can slow their progression.
When Telangiectasias Point to an Inherited Disorder
Not all telangiectasias are acquired. They can serve as visible markers of inherited conditions, sometimes appearing years before more serious complications develop.
Hereditary hemorrhagic telangiectasia (HHT), also known as Osler-Weber-Rendu syndrome, is the most clinically significant genetic cause. HHT is an autosomal dominant disorder, meaning a person needs only one copy of the abnormal gene to be affected. It disrupts normal blood vessel formation throughout the body. People with HHT develop telangiectasias on the lips, tongue, fingertips, and inside the nose, along with larger abnormal connections between arteries and veins (arteriovenous malformations) in internal organs. Complications include recurrent nosebleeds, anemia from chronic blood loss, and in some cases high-output heart failure.8PubMed Central. Hereditary hemorrhagic telangiectasia: diagnosis and management from the hematologist’s perspective The condition was first described in the 1860s, and the name “hereditary hemorrhagic telangiectasia” was proposed in 1912 by one of the physician William Osler’s students.9Elsevier / ScienceDirect (Genetics in Medicine). Genetest Review Hereditary hemorrhagic telangiectasia: An overview of diagnosis, management, and pathogenesis
Ataxia-telangiectasia (A-T) is a rarer and more devastating condition. It is autosomal recessive, meaning both parents must carry a mutation in the ATM gene for a child to be affected. Children with A-T develop progressive cerebellar degeneration (causing worsening balance and coordination problems), immunodeficiency, heightened cancer susceptibility, and sensitivity to radiation.10PubMed Central. Ataxia telangiectasia: a review The telangiectasias in A-T typically appear around age six, most commonly on the whites of the eyes and on sun-exposed areas like the ears and face. The mechanism involves dysfunction of the ATM protein, which triggers increased expression of a growth factor that promotes new blood vessel formation.11Seminars in Pediatric Neurology. Ataxia telangiectasia – Section: Non-neurologic manifestations
Telangiectasias as Clues to Systemic Disease
Beyond inherited disorders, telangiectasias can flag acquired systemic conditions. They are considered a hallmark of systemic sclerosis (scleroderma) and its limited variant known as CREST syndrome, where the “T” in the acronym literally stands for telangiectasia.12PubMed. Telangiectasis in CREST syndrome and systemic sclerosis: correlation of clinical and pathological features with response to pulsed dye laser treatment In these autoimmune conditions, the body’s immune system attacks connective tissue and blood vessels, producing widespread fibrosis and vascular damage. The telangiectasias appear on the face and hands and can be among the first visible signs of the disease.
Liver disease is another classic association. Spider angiomas, a specific star-shaped variety of telangiectasia with a central feeding arteriole and radiating legs, are frequently seen in people with cirrhosis. Research has linked their formation to elevated levels of substance P, a neuropeptide, in the blood of cirrhotic patients. In one study, substance P was the only independent predictor of spider angioma presence in people with cirrhosis.13PubMed Central. Role of substance P in the pathogenesis of spider angiomas in patients with nonalcoholic liver cirrhosis The practical takeaway is that new spider angiomas appearing on the upper body, especially in someone who drinks alcohol, warrant checking liver function.
Radiation therapy can also produce telangiectasias in the treated area, sometimes years after the course of treatment ends. The radiation damages blood vessel walls and the surrounding connective tissue, leading to permanently dilated vessels in the irradiated skin or mucosa. Radiation-induced telangiectasias in the rectum, for instance, can cause chronic bleeding that requires endoscopic treatment.
How Telangiectasias Are Identified
Most telangiectasias are recognized visually. A clinician can confirm the vascular nature of a lesion using diascopy, which involves pressing a glass slide against the skin. If the red mark blanches (disappears under pressure and returns when pressure is released), it confirms the color comes from blood in a vessel rather than from bleeding into the tissue. Dermoscopy, a technique that uses a handheld magnifying device with a light source, can further characterize the pattern and vessel type.14Journal of Indian Academy of Oral Medicine and Radiology. The Bilateral Onset of Dilated Blood Vessels on the Face in a Pregnant Patient
The trickier diagnostic question is not whether a mark is a telangiectasia but what is causing it. A few isolated telangiectasias on the nose of a fair-skinned person in their fifties rarely need further investigation. But widespread telangiectasias in unusual locations, telangiectasias accompanied by recurrent nosebleeds, or telangiectasias in a child should prompt evaluation for underlying conditions. For HHT, clinical diagnosis relies on the Curaçao criteria, which consider the presence of recurrent nosebleeds, telangiectasias in characteristic locations, visceral arteriovenous malformations, and a first-degree relative with HHT. Meeting three of four criteria makes the diagnosis definite.
Treatment of Skin Telangiectasias
For telangiectasias that are purely cosmetic, laser therapy is the most widely used treatment. The principle is straightforward: a specific wavelength of light is absorbed by hemoglobin inside the dilated vessel, heating the blood and vessel wall enough to collapse the vessel without significantly damaging surrounding tissue.15Elsevier / The Clinics. Laser treatment of congenital and acquired vascular lesions: A review Pulsed dye lasers, which emit yellow light at 585 or 595 nanometers, are a common choice for superficial red telangiectasias. Longer-wavelength lasers like the Nd:YAG (1064 nm) penetrate deeper and work better for blue vessels or thicker-skinned areas.
Intense pulsed light (IPL), while technically not a laser, works on a similar principle and is often used for diffuse facial redness with scattered telangiectasias. It delivers a broad spectrum of light that can be filtered to target hemoglobin. Multiple sessions are usually needed for both laser and IPL treatments, and results are not always permanent since new telangiectasias can form over time if the underlying cause persists.
For leg telangiectasias (often called spider veins), sclerotherapy is an alternative. This involves injecting a chemical irritant directly into the vessel, causing it to scar shut and eventually be reabsorbed. Sclerotherapy tends to work better for slightly larger vessels than the very fine telangiectasias on the face, and it is commonly combined with laser treatment in practice.
When Telangiectasias Bleed Internally
Telangiectasias are not always limited to the skin. In HHT, they can form along the lining of the gastrointestinal tract, where they are prone to chronic low-grade bleeding that leads to iron deficiency and anemia over time. A long-term study of endoscopic treatment for GI bleeding in HHT patients found that the vast majority responded to repeated endoscopic sessions. Median hemoglobin levels in those patients rose from around 7 g/dL at baseline to about 12 g/dL, and the number of blood transfusions needed per year dropped substantially. However, patients with a higher number of telangiectasias at the outset were less likely to achieve a full response.16PubMed Central. Gastrointestinal bleeding in patients with hereditary hemorrhagic telangiectasia: Long-endoscopic treatment – Section: Results
Radiation-induced rectal telangiectasias present a similar bleeding problem in a different population: people who have received pelvic radiation for prostate, cervical, or rectal cancer. A randomized trial comparing two endoscopic cauterization methods found that both significantly reduced severe bleeding episodes and raised blood counts compared to medical therapy alone, with new telangiectasias that formed afterward being easily managed with retreatment.17PubMed. A randomized prospective study of endoscopic bipolar electrocoagulation and heater probe treatment of chronic rectal bleeding from radiation telangiectasia The message for patients dealing with chronic GI bleeding from telangiectasias, whatever the cause, is that repeated endoscopic treatment is generally effective and well-tolerated, though it often requires maintenance over time.
The Psychological Weight of Visible Telangiectasias
Clinicians sometimes underestimate how much visible telangiectasias affect the people who have them. Research on patients with HHT has shown that quality of life is reduced across nearly every measurable domain compared to population norms. The duration of nosebleeds, the presence of GI bleeding, and the number of visible telangiectasias on the face all correlated with lower quality-of-life scores.18PubMed. Health-related quality of life in hereditary hemorrhagic telangiectasia
A more focused study using a facial appearance questionnaire found that patients who perceived their facial telangiectasias as cosmetically disturbing had lower social functioning, greater appearance-related psychological distress, and lower satisfaction with the appearance of their nose. The effects were not trivial in size, and they persisted after accounting for other factors like anemia.19PubMed Central. Impact of facial telangiectasias and anemia on quality of life in patients with hereditary hemorrhagic telangiectasia: a cross-sectional study using FACE-Q This finding has practical implications: treating facial telangiectasias in HHT patients is not just cosmetic vanity but a legitimate quality-of-life intervention. The same principle applies to people without HHT who feel self-conscious about visible vessels on their face. Insurance coverage for laser treatment varies and often classifies it as cosmetic, but the psychological burden on patients suggests the line between cosmetic and medical is blurrier than billing codes imply.
Telangiectasias Versus Spider Veins Versus Broken Capillaries
People use several terms loosely to describe the same phenomenon, but the distinctions are worth knowing. “Telangiectasias” is the medical term covering any permanently dilated small vessel visible at the surface. “Spider veins” is a colloquial term usually referring to telangiectasias on the legs, named for their branching pattern that resembles a spider’s web. “Broken capillaries” is a misnomer that persists in skincare marketing. The capillaries are not actually broken; they are dilated and intact. No blood is leaking out, which is why the marks blanch with pressure. The term “broken” probably persists because it gives people a mechanical explanation that feels intuitive, even though it is wrong.
Spider angiomas, mentioned earlier in the context of liver disease, are a specific subtype with a central arteriole and radiating branches. They blanch in a distinctive pattern: pressing the center causes the entire lesion to disappear, and releasing pressure produces a visible refill from the center outward. This is different from a generic telangiectasia, which blanches uniformly. Recognizing this pattern can help distinguish a spider angioma from other vascular marks, which matters because spider angiomas in certain distributions carry different clinical implications.
Cherry angiomas, the small dome-shaped red bumps that become increasingly common with age, are sometimes confused with telangiectasias but are structurally different. Cherry angiomas are proliferations of new capillaries forming a raised bump, while telangiectasias are existing vessels that have stretched wider. The distinction is visible: cherry angiomas are round and raised, telangiectasias are flat and linear or branching. Both are overwhelmingly benign, but they form through different mechanisms and respond to slightly different treatments.