This document summarizes a graduation project from 2020 in which the author created a dermatology reference book to help with differential diagnoses. As a dermatologist, the author faced challenges remembering the differential diagnoses for each case seen in clinic. The book aims to list almost all dermatological lesions one may encounter in practice. It took 6 months of hard work to complete the classification. The author thanks other reference books that provided pictures. They believe the atlas will be essential for anyone studying or working in dermatology.