I bought salmon a week ago and wanted to make it for dinner today. When I took it out of the refrigerator, it had a yellow stain on it. What is it?

You’re not imagining things — salmon can develop strange-looking colors after being stored, and a yellow stain can be alarming. But before you panic, it helps to know what it could be and whether the fish is still safe to eat.

Here’s what that yellow stain might mean, and what to do next.

1. It Could Be “Fat Bloom” (Common and Harmless)