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A spider angioma or spider naevus (plural: spider naevi), also nevus araneus, is a type of telangiectasis [2] (swollen, spider-like blood vessels on the skin) found slightly beneath the skin's surface, often containing a central red spot and deep reddish extensions (see Blood color) which radiate outwards like a spider's web or a spider's legs.
Telangiectasias (from tel- 'end' angi- 'blood vessel' and ectasia 'the expansion of a hollow or tubular organ'), also known as spider veins, are small dilated blood vessels [1] that can occur near the surface of the skin or mucous membranes, measuring between 0.5 and 1 millimeter in diameter. [2]
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'Foam sclerotherapy for reticular veins of the dorsal hands: a retrospective review." Dermatol Surg. 2014 Aug;40(8):892-8. doi: 10.1097/DSS.0000000000000076. Massaki AB, Kiripolsky MG, Detwiler SP, Goldman MP (2013). Endoluminal laser delivery mode and wavelength effects on varicose veins in an ex vivo model. Lasers Surg Med. 2013 Feb;45(2):123-9.
Sclerotherapy is the "gold standard" and is preferred over laser for eliminating large spider veins telangiectasias. [Telangiectasia is a condition in which broken or widened small blood vessels that sit near the surface of the skin or mucous membranes create visible], and smaller varicose leg veins. [18]
Human blood in veins is not actually blue. Blood is red due to the presence of hemoglobin; deoxygenated blood (in veins) has a deep red color, and oxygenated blood (in arteries) has a light cherry-red color. Veins below the skin can appear blue or green due to subsurface scattering of light through the skin, and aspects of human color ...