Gynecomastia Hormones

I have 15 years and have circular bumps on both my nipples hard. Should I worry?
I have 15 years and I have a hard lump under two of my nipples. I heard it could be something called gynecomastia, and I've also heard that it is simply an accumulation of hormones of puberty, but I'm not sure. Take me school for these items. They were each the size of a golf ball and are tender. I wonder what he thinks of this type. Thanks
ummm Ewww!?
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