Avoiding the sun is a must when undergoing any treatment for hyperpigmentation, since sun exposure can exacerbate dark spots and patches.
If you’re frequently in the sun while you’re getting either professional treatments or using a lightening product at home, it may be impossible to reduce pigmentation. Even if you successfully fade your unwanted discoloration but then get exposed to UV light, you may find that those spots come right back.
It’s also important to remember that UVA rays can easily travel through windows, so you need to wear sunscreen even when you’re indoors, not to mention year-round.
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