The follow up or also referred as the touch up and perfecting appointment, is usually necessary for permanent cosmetic procedures. Some people will only need one treatment however most treatments will require at least one follow up, and some rare skin types will require a third follow up appointment.
This is based on the health of the skin, how the skin heals in terms of receiving pigment, and other medical factors. These appointments are available in the 6-12 week time frame for design changes and adjustments.