In all biopsies, the density and distribution of different subsets of cutaneous nerve fibers will be determined by immunohistochemistry in the frozen-fixed tissue and the presence or absence of histopathologic features of seborrheic dermatitis will be evaluated in the paraffin-embedded tissue. Left over tissue from either the frozen and/or the paraffin-embedded tissue will be saved in a repository if the individual consents, and the storage of these tissues and safeguards are described in detail in the tissue banking section of the BMC approved IRB protocol.