The Old Testament law commanded the Israelites, “Do not cut your bodies for the dead or put tattoo marks on yourselves. I am the LORD” (Leviticus 19:28). So, even though believers today are not under the Old Testament law (Romans 10:4; Galatians 3:23-25; Ephesians 2:15), the fact that there was a command against tattoos should cause us to question. The New Testament does not say anything about whether a believer should or should not get a tattoo.
In relation to tattoos and body piercings, a good test is to determine whether we can honestly, in good conscience, ask God to bless and use the particular activity for His own good purposes. "Whether therefore ye eat, or drink, or whatsoever ye do, do all to the glory of God" (1 Corinthians 10:31). The Bible does not command against tattoos or body piercings, but it also does not give us any reason to believe God would have us get tattoos or body piercings.
1 Corinthians 6:19-20: "What? know ye not that your body is the temple of the Holy Ghost which is in you, which ye have of God, and ye are not your own? For ye are bought with a price: therefore glorify God in your body, and in your spirit, which are God's."