Light skin colour and high freckle density were also highly significant risk factors, independent of each other and of naevus count and hair and eye colour.
[ncbi.nlm.nih.gov]
Sturm and Eirikur Steingrimsson, Sun‐induced freckling: ephelides and solar lentigines, Pigment Cell & Melanoma Research, 27, 3, (339-350), (2014). M. Binstock, F.
[doi.org]
They look like a freckle but they're usually larger, darker and stand out more than a normal freckle. They can gradually get bigger and may change shape.
[www2.hse.ie]