Nips turn puffy in warm temperatures and erect (hard) in cold. Is this gyno?

Is this gyro or not? Literally looked all over the internet. So many idiots beat around the bush and cannot get to the point. I’am 18 years old and I have had puffy nipples for a while now. I was told by many people that they will go away by the time I reach 20. Is this true? I do not feel any lumps or any bull**** like that. It’s just puffy and it just stays that way unless I’m cold or if I work out.
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Nips turn puffy in warm temperatures and erect (hard) in cold. Is this gyno?
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