Diseases

Freckles

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Freckles. ... The medical term for this type of freckle is ephelis (plural ephelides). The colour is due to pigment accumulating in the skin cells (keratinocytes). Skin pigment (melanin) is made by cells called melanocytes. They don't produce much melanin during the winter months, but produce more when exposed to the sun.

SYMPTOMS

Most freckles are produced by exposure to ultraviolet light and typically fade in the winter. Unusual-appearing freckles may become malignant skin cancer. Peculiar appearing or symptomatic colored or pigmented spots should be examined by your dermatologist.

CAUSES

The formation of freckles is caused by exposure to sunlight. The exposure to uv-b radiation activates melanocytes to increase melanin production, which can cause freckles to become darker and more visible.