These white spots from sun exposure are usually attributed to a condition called idiopathic guttate hypomelanosis.
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What exactly is idiopathic guttate hypomelanosis?
Idiopathic guttate hypomelanosis is a disorder that causes 1 to 10 mm flat white spots to occur, typically on the shins, arms upper back and face. It is usually found in fair-skinned individuals but can also occur on the dark skin. While their exact cause is still unknown, these spots often start to form as a person ages, and more specifically after the age of 40.
The white spots are benign and are thought to be caused by sun exposure, which kills melanocyte cells in the skin. No treatment is usually needed, but preventative measures to block against sun damage should be taken. Topical steroids, creams, and dermabrasion can be used to minimize the appearance of these spots.
Sometimes depigmentation can be caused by other factors and becomes more noticeable after sun exposure. Take a look at other possible causes of white spots on the skin.
Read More: Early melanoma symptoms and how to spot them
Suspicious skin spots? Use SkinVision to check your skin for signs of skin cancer and get an instant risk indication.