Haraam (Forbidden)

The following hadith, recorded by Bukhari: "It was narrated that Abu Juhayfah (may God be pleased with him) said: “The Prophet (peace and blessings of God be upon him) cursed the one who does tattoos, and the one who has a tattoo done.”

Scholars have outlined various possibilities for the prohibition as follows:

Tattooing is considered "mutilating" the body, changing God's creation
It inflicts unnecessary pain, and introduces infection
It covers the natural body, and is a form of "deception"
Non-believers often adorn themselves this way, so it is "imitating the kuffar"