Cherry angioma (a.k.a. Campbell de Morgan spots, Strawberry Naevi and Red Moles) are small, harmless (non cancerous) skin tumours which have an abnormally high number of surface blood capillaries - hence their red colouration and name.
They are extremely common - nearly all adults over 30 have some examples. Their numbers tend to increase with age.
The exact cause is unknown, but there may be a genetic factor that makes some people more likely to get them. They've also been linked to pregnancy, exposure to chemicals, some medical conditions, and climate.
Further info DermNet NZ
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