Is there any taboo if you want to tattoo a Prajna flower arm?

No, it's not official. It is better to be a positive Buddha.

Buddha statues can be made of any material, such as earth, stone, gold, silver, copper and iron, not to mention skin! It is also a merit to sacrifice one's life for righteousness and build Buddha statues! Respect everything! ! Tattoos have to endure a lot of pain in order to get rid of karma. All suffering is karma. If the karma is small, they won't get sick and everything will be lucky.