Lentigo characterized by a chronic course and a slow growth rate. The most commonly occurs in older people (60-70 years). Women with lentigines are more common than men. However, mortality from lentigo when malignancy is higher in males, as in this case, the tumor becomes more aggressive form.
Lentigines may occur on the face, sometimes on the neck, on the hands and legs. The first symptom of malignancy lentigo is the formation of small inconspicuous infiltration, which becomes inflamed and palpation is detected in the form of a nodule under the skin.
Malignant melanoma lentigo can give early metastasis limpiando and hematogenous, therefore, is a cause of high mortality from skin cancer (up to 75% of the total number of cases). Annually worldwide lentiginosa ill 92 000 people. In the last 30 years there has been an increasing incidence in the white population.
There are several types lentigo:
1. Senile (liver, senile spot) emerging from behind a senile (senile) of disorders of metabolism, resulting in excessive deposition of melanocytes in the skin.
2. Children and youth – occurs in the first decade of a child’s life and has no connection with the solar irradiation.
3. Solar – occurs under the influence of solar radiation.
4. Hereditary (disease Touraine, periorificial form) is transmitted over the dominant principle of inheritance and new elements lentigines occur throughout life.