[HELP] Is this a lens fungus or dust?? SHOULD I BE WORRIED???

Is this a lens fungus or dust?? SHOULD I BE WORRIED??? Hello! I just bought a used Sony 20mm f.18 and upon initial inspection, I didn't notice any problems. When I got home and got time to do a closer look, I find this dot with a round circle inside the rear of the lens. It's not on the surface I'm pretty sure. Is this a dust or a fungus... and should I be worried??? https://preview.redd.it/437svkps...

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