The aim of this study is to investigate a type of skin cancer, also known as melanoma, in children, adolescents, and young adults, who will be referred to as CAYA patients in this project. The need for this study arises because this disease, in CAYA patients, is still poorly understood due to its rarity in individuals under 30 years old. This often leads to difficulties in assessing its severity and, consequently, in deciding on the necessary treatments to ensure the patient\'s recovery. The goal of this study is to examine melanoma in CAYA patients in order to gather the information needed to provide better diagnoses for affected patients and, as a result, select appropriate treatments to fight the disease and promote the patient\'s full recovery. Additionally, the data collected will be used to create a Pan-European online platform that will allow doctors across the European Union to consult the obtained data and collaborate on particularly complex melanoma cases, always with the aim of ensuring the patient\'s full recovery in the shortest possible time.