Painless red bump what is it?

Not sure. There are a # of possible causes. The best way to get an accurate diagnosis would be dermatological evaluation.
Visual DX. Hi, it’s hard to say without a picture but there is a great app that may be able to help you get a diagnosis without being seen in person by a dermatologist. The app is called VisualDX and is one of the best, if not the best out there. Many clinicians, including myself, use it. Just snap a photo and it gives you a list of possible diagnoses. Good luck!

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