ピアスを開けた後は純金や純銀のイヤリングを着用しなければならないというのは迷信です?

いいえ、それは神話ではなく、その記述の一部さえも間違っています. シルバーも着用できず、非常に高いカラットのゴールドのみを着用できます (22k以上をお勧めします, ノブウム, サージカルステンレスと一部のプラスチック).
純銀は急速に酸化します, pure silver even faster. Imagine what it would do inside the moist environment of your skin. Bad, bad choice. Any metal that either naturally oxidizes in air is not good enough for a new piercing. Think about grandma’s tarnished tea set. Imagine this inside your skin.
14k gold is not good enough either for most people. Some can tolerate 18k. I usually custom make the piercing jewelry for my clients and always at least 22k although I recommend nobium for the first 10 weeks then come back for gold. Don’t use silver for about a year. (For body piercings that is, ear lobes seem to heal quicker; everyone is different)
It is no myth. Surgical steel or gold, as pure as you can afford. Some people won’t have a reaction with dirty tin, or an old safety pin. Some will. You want to minimize the possibility of infection, 刺激, or inflammation; none of those things will feel good or look nice.
金, and if that’s out of your price range, surgical steel, which anyplace that does piercings should sell, is the way to go.
