SKINIPEDIA - Skin Essentials: Spider Angioma

Skin Essentials: Spider angioma

Spider angioma (Nevus araneus) is an abnormal collection of blood vessels near the surface of the skin. A spider angioma lesion typically has a red dot in the center with reddish extensions radiating out for some distance around it (a few millimeters to a centimeter or more). Spider angiomas can occur anywhere but are most common on the face and trunk.

Within the epidermis, melanocytes reside in the basal layer in a ratio of about 10 keratinocytes to 1 melanocyte. However, each melanocyte via its dendrites supplies melanin to about 30 nearby keratinocytes.

 

Causes

Spider angiomas are very common. They are especially common during pregnancy and in patients with liver disease. They occur in both children and adults.

Symptoms

• Blood vessel sore (lesion)
  • May have a red dot in the center
  • Has reddish extensions that reach out from the center
  • Disappears with pressure and reappears when pressure is released
• Most often seen on the face and neck

Exams and Tests

No testing is usually necessary, but a skin biopsy may be needed to confirm the diagnosis in some cases. Blood tests may be done if a liver problem is suspected.

Treatment

Treatment is generally not necessary. In some cases, electrocauterization or laser treatment may be used.

Outlook (Prognosis)

Spider angiomas often disappear in children but tend to persist in adults.

When to Contact a Medical Professional

A spider angioma can usually be examined during a routine visit with your health care provider. It is important to mention to your doctor if you develop a new spider angioma, to rule out related medical conditions.

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