A red bump appeared on my face months ago. It doesn't disappear. What could it be and what can I do about it? (photos)

Hi. A red bump appeared on my face two months ago and hasn't gone away. I have occassional acne but nothing serious, but this bump has not gone away. Its bothering me and I was wondering what it could possibly be and what can be done about it. I have tried tretinoin but it had no effect. Could it be a wart? Or Acne scar tissue? I haven't had a pimple on that spot. Many thanks for your input!

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