Is it rude for people to ask if you got plastic surgery?

Is it rude to ask someone if they got lip fillers, botox, plastic surgery simply by observation? I've been asked if I have lip fillers by strangers and friends and I find it a slightly weird question. I've never had them. But is it weird or rude to ask people that question? Why do people ask people if they've had plastic surgery?

Is it rude for people to ask if you got plastic surgery?
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