Little lump in armpit?

Little lump in armpit?

Hello, so two weeks ago a lump suddenly appeared in my armpit that feels hard and is shaped like a pea. When it first appeared it hurt a lot specially when i would move my arm or raise it. After a few days it stopped hurting but it’s still there but i feel like it has decreased in size a little. Is it concerning or do I give it another week to see if it goes away on its own?

Little lump in armpit?
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