What Causes Spider Angiomas: Pregnancy, Estrogen, and Liver Health

Spider angiomas are small red marks with a central red dot and radiating vessels that look like a spider web pressed into the skin. They are almost always harmless and caused by elevated estrogen: during pregnancy, while taking oral contraceptives, or as a normal hormonal shift. When they appear without a clear hormonal reason and multiply quickly, they can occasionally signal liver disease and are worth a doctor's attention. The vast majority of spider angiomas are benign and fade on their own once the estrogen trigger passes.

For the complete picture of what spider angiomas look like and how they are identified, see our full spider angioma guide. This article answers the specific question of what causes them.

What a spider angioma actually is

A spider angioma is a dilated central arteriole (the "body" of the spider) feeding a network of small radiating vessels (the "legs"). Press on the center with a fingertip and the whole lesion blanches; release and it refills outward from the center. That central-refill pattern is the diagnostic tell that separates spider angiomas from other red skin marks.

They appear most often on the face, neck, chest, and forearms. Size ranges from a pinpoint to about a centimeter. The same estrogen-driven mechanism explains both the common benign forms (pregnancy, oral contraceptives) and the rarer liver-associated form, which is why understanding the cause matters for knowing what to do next. The American Academy of Dermatology includes spider angiomas among the benign vascular lesions that are routinely evaluated in clinical skin exams.

The established causes: estrogen, liver, and pregnancy

The evidence behind each cause is not equal. Here is the calibrated split before the detail.

Established (well-supported in the literature): elevated estrogen from pregnancy, oral contraceptives or hormonal therapy, and liver disease (cirrhosis, chronic hepatitis B or C).

Suspected (observed but not conclusively proven): perimenopause-related hormonal fluctuation, local skin trauma at the site.

Not established (no proven cause-and-effect link): diet, hygiene, stress, sun exposure (UV can worsen existing lesions but does not initiate the underlying mechanism).

Pregnancy

Estrogen rises dramatically across the first and second trimester, and up to two thirds of pregnant women develop spider angiomas as a direct result. They appear most commonly on the face, neck, and upper chest. They are benign, caused entirely by the hormone surge, and typically fade or disappear within weeks to a few months after delivery. No treatment is needed or recommended during pregnancy. This is the single most common context for spider angiomas in otherwise-healthy women, and a new spider angioma during pregnancy is almost never a reason for concern.

Oral contraceptives and hormonal therapy

Combined oral contraceptives contain synthetic estrogens that raise circulating estrogen by the same mechanism as pregnancy. Hormone replacement therapy with an estrogen component can do the same. When a spider angioma appears soon after starting or adjusting hormonal therapy, the timing is almost always the explanation. In most cases the lesion either stabilizes or fades if the hormonal dose is adjusted, though many people find the mark harmless enough to leave alone.

Liver disease

The liver is responsible for metabolizing and clearing circulating estrogen. When the liver is damaged by cirrhosis, chronic hepatitis B or C, or alcoholic liver disease, it loses the ability to clear estrogen efficiently. Estrogen accumulates, dilates small skin arterioles, and spider angiomas appear. In this context the lesions typically come in multiples, concentrate on the upper body, and accompany other recognized liver-disease skin signs: palmar erythema (reddening of the palms), possible jaundice, or abdominal changes. The Mayo Clinic lists spider angiomas among the physical findings that prompt evaluation for liver dysfunction. A single spider angioma on its own is not a liver disease flag; multiple lesions with no hormonal explanation are.

What the evidence says by factor

The same picture, sorted by how strong the support actually is.

Spider angiomas vs cherry angiomas: the key difference

Both are benign vascular marks, and both become more common during hormonal fluctuation states, which is why they are often confused. The physical appearance is different once you know what to look for.

A spider angioma has a central feeding vessel with radiating "legs" extending outward. A cherry angioma is smooth, dome-shaped, and solid red with no radiating pattern. The underlying mechanism differs: cherry angiomas are local proliferations of blood vessels that do not depend on systemic estrogen, while spider angiomas are dilated arterioles driven by elevated circulating estrogen. For a full side-by-side comparison, see our guide to cherry angioma vs spider angioma.

A third look-alike is broken capillaries. Unlike spider angiomas, broken capillaries have no central dot and no radiating pattern. They appear as thin, branching red lines, most often across the nose and cheeks. Learn more in our guide to broken capillaries on the face.

When to see a doctor: the safety line

A single spider angioma in a pregnant woman or someone on hormonal therapy is almost always nothing to act on. The reassurance threshold and the concern threshold are both specific.

The NIH MedlinePlus skin conditions resource is a reliable starting point for understanding when a skin finding warrants medical evaluation. The guidance for spider angiomas is consistent: isolated lesions with an obvious hormonal reason are benign; multiples without an explanation need a clinical eye.

The estrogen connection means that for most women, a spider angioma during pregnancy or on the pill is the body doing what it does. The mark is the signal, not the problem.

What to do about a spider angioma at home

After a hormonal trigger resolves, spider angiomas often fade on their own. For persistent ones, or for lesions that appear during a stable hormonal state, the OcuraLife Plasma Pen offers an at-home option. It delivers controlled plasma energy to the central vessel, addressing the dilated arteriole directly. Each treatment takes about five minutes per lesion. A small protective scab forms and lifts on its own between Day 3 and Day 7. The skin is typically clear by Week 2 to Week 3. Nine intensity settings let you adjust to the size and sensitivity of the spot.

For a full guide to at-home plasma pen use for vascular marks, see our best at-home plasma pen roundup. For safety information, see our plasma pen safety guide.

FAQ

Frequently asked questions

Common questions about spider angioma causes and what to do about them.

Here are the questions readers ask most often about spider angioma causes, with direct answers.

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The bottom line

Spider angiomas are almost always an estrogen story. Pregnancy and oral contraceptives are the most common benign triggers. Liver disease is a real but rarer explanation. The difference between the two is usually clear from context: a single lesion with a known hormonal reason is benign; multiple lesions with no explanation and other physical signs warrant a doctor's evaluation.

The marks are harmless in the vast majority of cases. Many fade on their own once the hormonal trigger passes. For persistent lesions, there are options. Start with what is causing it, and the right next step becomes clear.

Also in the vascular-lesions cluster:

• Spider Angioma: The Red Spider-Web Mark and How to Remove It
• Tiny Red Veins on Your Nose and Cheeks: Broken Capillaries Explained
• Can You Treat Broken Capillaries at Home?
• Cherry Angioma vs Spider Angioma: How to Tell the Difference