There are minimal side effects to laser tattoo removal. However, you should consider these factors in your decision: The tattoo removal site is at risk for infection. You may also risk lack of complete pigment removal, and there is a slight chance that the treatment can leave you with a permanent scar.
I think that only what, 60 to 70 % if your very lucky, of tattoos can ever be removed? And if you want to know the side effects, look at roosters answer.
I read that tattoo removal can be painful, expensive, and time-consuming. Despite the intended permanence of tattoos, various methods are used in attempts to remove them: Laser removal (burning the tattoo away), surgical removal (cutting the tattoo away), dermabrasion (sanding the skin with a wire brush to remove the epidermis and dermis), salabrasion (using a salt solution to soak the tattooed skin), and scarification (removing the tattoo with an acid solution and creating a scar in its place). These methods are expensive and can be painful. “It’s more painful to have a tattoo removed by laser than to get the original tattoo,” says Teen magazine. Also more modern, multicoloured tattoos, especially if they are large, are almost impossible to remove.