Other NURF mutants cause the development of melanotic tumors from larval blood cells. It is also known as "Hutchinson's melanotic freckle". It is part of neural crest tissue, often present in melanotic neuroectodermal tumor of infancy. Vermillion border of the lips is the most common site to find melanotic macules. Herpetic whitlow and melanotic whitlow are subtypes that are not synonymous with the term "felon". Dark-skinned people may have a melanotic line along the gum margin. Melanotic macules can be found on the buccal mucosa, lip, palate, alveolar ridge and gingiva. Melanotic is considered incompletely dominant because heterozygotes are unlike either homozygote.