What is going on with my fruit?

Question

Was wondering what could be the cause of that brown spot.

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Answer 1

Is this some type of plum? You should inspect the leaves, as well, to make sure you're not having insect infestation.

These articles should help: https://www.gardeningknowhow.com/edible/fruits/plum/plum-tree-diseases.htm.
https://www.gardeningknowhow.com/edible/fruits/plum/common-plum-tree-pests.htm