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How long has it been like that?
Was it getting irritated by what you wear?
What part of your chest is it?
How is your hygiene?

Have a close look at this mole, does it have a hair growing out of it, even if it is a tiny tiny one?

Moles with hair do not turn into malignant tumours such as cancer.

Nevertheless, I'd suggest to show it to an oncologist.
+4