Why Does Pigmentation Become Worse During Summer? Hot Weather often causes pigmentation, tanning, and patchy skin tone in many people. If you want to know why pigmentation increases in summer, the biggest reason is strong ultraviolet rays from sunlight. In hot weather, the body creates extra melanin to defend the https://medium.com/@drnikitapatel2025/why-does-skin-pigmentation-increase-in-summer-62ea6eb7f9d0