box around cursor pygame

In the little games I made in pygame there's always a box around my cursor in which all colours are reversed (e.g. if I hold my cursor over a black and red background the square around the cursor will be white and cyan). This initially wasn't a problem, since the first few projects only required keyboard inputs, but now I want to make a game where you have to click a lot, so it would look very ugly. How do I remove this box? I am using macOS High Sierra, python3 and pygame 1.9.3.

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