In dermatology, the CO2 laser is used for tissue vaporization. Compared
to the conventional scalpel, it offers the possibility of precise tissue removal
without touching the tissue. Thus, feeling of pain is significantly reduced. External
ulcers and refractory warts are common indications. In warts, however,
deep lesions should be performed to reduce the probability of recurrence.
Recently, argon ion and CO2 lasers have also gained attention in efficiently
removing tattoos. Clinical studies were reported by Apfelberg et al. (1979b)
and Reid and Muller (1980). Today, ruby lasers are commonly used for tattoo
removal as stated by Scheibner et al. (1990) and Taylor et al. (1990). Indeed,
good results can be obtained, although they do depend on the dyes used in
the tattoo. It is extremely important that all dye particles are removed during
the same session.