Small black lump on toe

Hello there, earlier today I discovered a small black lump on my Big toe. It’s painless but is worrying me, can you please give me some advice on what you think it may or may not be and what to do? Attached Thumbnails  

Hello there, earlier today I discovered a small black lump on my Big toe. It’s painless but is worrying me, can you please give me some advice on what you think it may or may not be and what to do? Attached Thumbnails  

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Small black lump on toe