It looks like natural pigmentation, and it could be a sign that the plant is at the upper end of its light preference / tolerance. Essentially the orchid equivalent of a sun tan. Hard to know for sure since you didn't really tell us much and there's only the one photo from a single angle.
The lower leaf is showing some signs of dying off. That's not necessarily a bad thing, they shed old leaves like many other plants, but it might also be a symptom of the plant needing to be repotted or other issues. Unfortunately, we don't have any information to go on and few details. For the most part, from what I can tell the plant looks reasonably healthy.
It's a Phalaenopsis hybrid.
You don't have to wait until it's done flowering to repot. Repotting might lead to the flowers dropping off earlier than they otherwise would have, but it's not like anyone can predict one way or the other. Either way, it's a good time of year to repot because it's spring, days are getting longer and temperatures are getting warmer, plus it'll have the whole spring and summer to grow and build up strength.
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