Molecular Analysis of Childhood and Adolescent Melanocytic Lesions

Inclusion Criteria: * Participant has a suspected or confirmed diagnosis of a melanocytic lesion, including: * Conventional or "adult-type" melanoma * Spitzoid melanoma/atypical Spitz tumor * Congenital melanoma * Melanoma arising in a giant congenital nevus * Melanocytic lesions with indeterminate biological behavior (e.g., pigment synthesizing melanomas) * Participant was \<19 years of age at the time of diagnosis. * Tissue is available for biologic studies. * Participant has been enrolled on the TBANK protocol at SJCRH, or will be enrolled before any research tests are performed on their biological materials. Exclusion Criteria: * Ocular melanoma * Inability or unwillingness of research participant or legal guardian to consent. * Histologic diagnosis other than melanocytic lesion described in 3.1.1.