Cause
Cherry angiomas appear spontaneously in many people in middle age but can also, less commonly, occur in young people. They can also occur in an aggressive eruptive manner in any age. The underlying cause for the development of cherry angiomas is not understood. Cherry angioma may occur through two different mechanisms: angiogenesis (the formation of new blood vessels from pre-existing vessels), and vasculogenesis (the formation of totally new vessels, which usually occurs during embryonic and fetal development).One study published in 2010 found that a regulatory nucleic acid suppresses protein growth factors that cause vascular growth. This regulatory nucleic acid was lower in tissue samples of hemangiomas, and the growth factors were elevated, which suggests that the elevated growth factors may cause hemangiomas. The study found that the level of microRNA 424 is significantly reduced in senile hemangiomas compared to normal skin resulting in increased protein expression of MEK1 and cyclin E1. By inhibiting mir-424 in normal endothelial cells they could observe the same increased protein expression of MEK1 and cyclin E1 which, important for the development of senile hemangioma, induced cell proliferation of the endothelial cells. They also found that targeting MEK1 and cyclin E1 with small interfering RNA decreased the number of endothelial cells. A study published in 2019 identified that somatic mutations in GNAQ and GNA11 genes are present in many cherry angiomas. These specific missense mutations found in hemangiomas are also associated with port-wine stains and uveal melanoma.
Granuloma multiforme  is a cutaneous condition most commonly seen in central Africa, and rarely elsewhere, characterized by skin lesions that are on the upper trunk and arms in sun-exposed areas. : 707  It may be confused with tuberculoid leprosy, with which it has clinical similarities. The condition was first noted by Gosset in the 1940s, but it was not until 1964 that Leiker coined the term to describe "a disease resembling leprosy" in his study in Nigeria. See also
Skin lesion

References


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