• dermatological features
• lesions similarity
• Barlow twins
• Siamese neural networks
• melanoma detection

Malignant melanoma (MM) and non-melanoma skin cancer (NMSC) are the two main skin tumor. The NMSC incidence is higher than MM but the mortality rate is more worrying in the second one, since the 5-year survival rate decreases significantly as the melanoma stage increases. Therefore, frequent self-screening and screening by the dermatologist is advisable. Once several features are observed, the dermatologist decides whether to perform biopsy and then histopathological examination. To assist the clinician in skin cancer detection, convolutional neural networks (CNN) have been implemented. Their use is still very limited due to a skepticism concerning the black-box nature of the neural networks. However, several studies have shown CNN are able to outperform the average of dermatologists in lesions classification tasks. The aim of this work was twofold: dermatological features were extracted from melanomas and nevi to provide objective information and overcome semi-quantitative evaluations. To assess the rightness of the implemented model, probability densities of the extracted parameters were generated. These show high consistency with the ABCD criteria. Further investigations will be conducted to evaluate the results generalizability. Secondly, a Siamese deep neural network was implemented to discriminate between melanomas and nevi. This work is part of a larger industrial project, where the network was created to support an ensemble of multiclass classification models showing suboptimal performance in discriminating these two types of lesions, due to their similarity. Limitations related to the large amount of labelled data needed to train it, the exigency of classifier and the possibility to exploit also non-labelled data from all the devices developed within the project led to the implementation of a new network considered as Siamese evolution, called Barlow twins, which showed great potential. For the best of my knowledge, this is the first time these networks have been used to do this task.