Would a tattoo be a good option to cover cafe au lait spots?

Birthmarks are caused by increased pigmentation of the skin, so there are no contraindications for the cafe au lait spots to be covered with a tattoo. If you wish to move forward, I would recommend you discuss any allergies or skin conditions with a certified tattoo artist to ensure body compatibility with their ink. While healing, make sure to take proper care of the tattoo to avoid infection. If you suspect that are having a reaction while healing, I would recommend you follow up with a board certified specialist.
Best of luck, 
Kian Karimi MD, FACS

There are several ways to address your cosmetic birthmark removal concerns. See an expert physician who can advise you of removal options and well as ways to effectively proceed in a cover up. Best, Dr. Emer. 

Very specific pigments and techniques need to be used to camouflage a cafe su lait spot. Still based on my experience, the coverage will not be great and there is always a degree of color mismatch. Q-switched Nd YAG lasers tackle the actual melanin in the lesion and opting for this is preferable.