Does the sun make dark spots worse?
Short answer: Yes, the sun can make dark spots worse.
Detailed answer
Sun exposure can lead to the production of more melanin in the skin, which can make existing dark spots darker and more prominent. Ultraviolet (UV) radiation from the sun stimulates the activity of melanocytes, the cells that produce melanin. This can cause dark spots to become more pronounced and harder to fade. It is important to protect your skin from the sun's harmful rays by using a broad-spectrum sunscreen and seeking shade when the sun is strongest, particularly if you have dark spots or are prone to hyperpigmentation.
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