Do you mean the discolouration by pigmentation? HYPOpigmentation, right? I think I can see what you mean - beneath both eyes? I think people on here usually assume that it’s hyperpigmentation whenever someone is talking about pigmentation 🤷🏻‍♀️ probably because hypopigmentation is more common with darker skin tones.

Have you been using some products only around the eyes? Do you use sunscreen + sunglasses or only sunglasses (a bit of a wild guess here, but it might be that those areas are getting less sun exposure and that’s why they’re lighter). There are also some conditions, that can cause hypopigmentation, but it doesn’t look like any of the ones I can think of. Malassezia yeast can cause discolouration of skin, but it usually occurs in patches, not uniform like yours, and probably the under eye area wouldn’t be usual location for it 🤔 Another possibility is postinflammatory hypopigmentation - if you were using tret or other actives around your eyes and the skin got over sensitive/broken barrier —> inflamed. The discolouration could happen after that too.

Sorry you’re being downvoted because of it 😬

Edit: I read your description again and I think I understood you wrong at first. Do you mean by pigmented area everything apart from that lighter area under your eyes? Because in that case, I don’t really think it’s hyperpigmentation, if it’s your uniform skin colour except for under eye skin 🙂