The glue of tattoo stickers is non-toxic. Stickers can be sustained on a human body for around 3 to 5 days. However, if there is allergy, or you feel uncomfortable, please remove it immediately.
While removing tattoo stickers, you can gently and slowly rub the sticker with some alcohol. You can also stick the adhesive tape on the sticker, and directly remove the sticker.
It is to note that it may take some time to remove the stickers because of its viscosity.