system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What, exactly, is a skin tag?

How do they come about?
gpt
They are small harmless skin tumors. Not really sure why they pop up, could be from friction (they appear in areas with skin folds like armpits). There could also be a genetic component to it or an infectious component (some infections cause tumors, it could be a lower risk subtype of HPV)