How many treatments will be necessary?
Some types of pigmentation will respond better than others. Lentigines and freckles (superficial brown marks caused by age and/or sun) may only need a single treatment.
Other types may require multiple treatments, particularly deeper pigment spots such as seborrhoeic keratoses, café au lait spots, naevus of Ota and post-inflammatory pigmentation. Some (for example, hormonal pigmentation) can be quite resistant.