You will need a guardian until you're 18. But they aren't doing under mask piercings https://drpiercingfinejewelry.com/pages/alderwood
They aren't legally allowed to do it without a guardian there. Also, you may want to make sure they're still doing nose piercings post mask mamdate. Some piercers aren't doing any piercings that require your mask be taken off in order to do it.
Yes you will need a parent or legal guardian
You'll need to have your parents or guardian present. Possibly forms as well. The website might state which documents.
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