Nevus mapping (known as moles) could be described as a medical "photographic record" of nevi in the body, which is systematically checked for possible changes that may indicate cancer.
This is a basic record of the size, location and shape of the nevi, which is used as a basis for re-examination after specific intervals to be determined by the doctor.
This is an important diagnostic "tool" in the hands of an experienced dermatologist, which can really save lives.
Skin cancer, and especially melanoma, is one of the most life-threatening cancers, but early diagnosis means a great deal of cure.