Michael Sand gives the reader an overview of current techniques in expression profiling of miRNAs and their maturation machinery in the skin. This book is a postdoctoral thesis on miRNAs in cutaneous malignant melanoma and non-melanoma skin cancer with a focus on the miRNA processing machinery and miRNA expression profiling. The research presented in this book was performed in the Dermatologic Surgery Section at the Department of Dermatology, Venereology and Allergology of the Ruhr-University Bochum, Germany and gives the reader an overview of current techniques in expression profiling of miRNAs and their maturation machinery in the skin.