Oxidized eyebrow tattoo removal. Color is reddish brown

Unfortunately laser isn't an option for this.  The inks used in cosmetic tattoos usually have iron oxides which can change with time but will also turn orange/brown with laser removal.  Some options are to see if you can find someone to tattoo in a flesh tone or a dermatologist who can prescribe hydroquinone to try to lighten it.  You may want to call around or get a couple of opinions from a clinic with experience.  

I believe once the ink has oxidized and is a reddish brown color on your eyebrow, there is no laser that will work. i try and avoid treating eyebrows because of that problem. you can consider tattooing over it to try and hide it but that is also somewhat challenging to do.david berman md