Isn there any danger of damaging surrounding tissue in the laser removal of tattoos and blemishes?
No. A combination of selecting the right wavelength and pulse allows lasers to deliver energy faster than the surrounding tissues can conduct the heat, so they are not damaged. The Q-switched ruby laser, for instance, delivers light in nanoseconds (a nanosecond is a thousand millionth of a second), so that the melanin in liver spots is destroyed without any harm being done to the other layers of skin.
