Characteristics of Adult Patients With Melanoma Diagnosis <40 Years Age.

The primary objective of the study is to analyse a local cohort of patients aged 18-39 years with melanoma diagnosis in order to determine the prevalence of the disease in this age group. Secondary objectives are the following: * To identify risk factors associated with melanoma in young people. * To characterise the phenotype and dermoscopic features of melanoma in patients aged 18-39 years. * To analyse the relationship between the clinical and histopathological features of melanoma in young people. * To identify the mutational status of B-RAF in the sample of patients analysed.