Generally, use of a mandala is not considered cultural appropriation. However, there are some instance in which it may not be considered okay to use them, as defined by the cultures of origin. In particular
Your Tattoos Are Problematic
Thailand To Tattoo Tourists: Think Before You Ink : NPR
Create your own unique Mindful Mandala; beautiful artwork that can calm your mind. – Rumriver Art Center
Mandala Tattoo Inspiration: Finding Balance in Body Art + FAQ
Do mandala tattoos always carry religious meanings? - Quora
Redefining identity through mehndi – Coppell Student Media
Temporary Yoga Tattoos: Elevate Your Practice With Focus and Meaning – Tatteco
Am I Appropriating Another Culture in my Art? – Artist Strong
Discover the manga world of Mission tattoo artist Mimi-Sama - 7x7 Bay Area