It's an issue if you look like an Oompa Loompa. (I think that happens more with self tanners or spray tan.) You also don't want your skin to be dry or peeling. A little color is fine, but don't get so much that you totally have to change up your makeup and don't know what you're doing as far as that's concerned right before rush.
This picture is a good example of what not to do at rush, tan, clothing, and jewelry.
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