You don't have an "auto-immune system". Auto-immune means your immune system is attacking your own healthy cells.
Tattoos are fine. There's some evidence that maybe, maybe, immune system responses can be impacted by tattoos. But changes in immune system response does not necessarily mean impaired or negative.
> In outdoor daylight conditions, including shade, the UV content of incident sunlight is sufficient to activate PhotoTat to a photostationary state
https://www.cell.com/matter-light/fulltext/S3117-5848(26)001...
Tattoos are fine. There's some evidence that maybe, maybe, immune system responses can be impacted by tattoos. But changes in immune system response does not necessarily mean impaired or negative.