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- Skin, Hair and Nails
I'm a bit worried about a sebaceous cyst I had on my right arm a while back. I squeezed it a couple of times and now it's turned into this black hole, like there's a hole there and it's just black inside. The lump is gone and there's no swelling, but this black hole has been there for months and hasn't closed up. I'm attaching some pictures for reference. Is this something serious or should I be concerned about it?