Answer
Wa `alaykum as-Salamu wa Rahmatullahi wa Barakatuh.
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
No, ear piercings are not haram in Islam. The Prophet Muhammad (peace be upon him) referenced a woman with a pierced ear in a hadith recorded in Sahih Al-Bukhari, indicating permissibility. Since no authentic text prohibits ear piercing, it is considered halal—even multiple piercings are allowed.
Answering your question, Sheikh Kifah Mustapha, the Imam and Director of The Prayer Center of Orland Park and representative for Dar El Fatwa of Lebanon in the US, states:
The general rule in Islam is that; all matters are permissible unless there is an authentic text that says it is impermissible (haram). In this case, it was authenticated in Sahih Al-Bukhari that the Prophet (peace be upon him) asked Aishah (may Allah be pleased with her) to be like Umm Zar` who pierced her ear.
With that in mind and that no prohibition came to the number of piercing ear, it should be lawful to pierce ear twice or more.
Allah Almighty knows best.