GASTROINTESTINAL HEMORRHAGE (2): Melena. Melena, the passage of black, tarry stools, usually implies blood loss greater than 500 ml originating anywhere between the oropharynx and the right hemicolon. Melena occurs most often, Melanocytic nevi and melanoma: unraveling a complex relationship Oncogene From melanocytes to melanomas Nature Reviews Cancer This lovely patient was thrilled with her beautiful result after laser treatment of oral melanotic macules. I share this case to educate: laser treatment requires accurate diagnosis, an understanding of the differential a Melanotic macule at the wetdry line of the lower lip. b Melanotic Download Scientific Diagram Melanic pigmentation and light preference within and between two Drosophila species Cooley 2021 Ecology and Evolution Wiley Online Library