Draco mindanensis of this species' patagium, or the extensible fold of skin used in flight, is red in males and dusky in females. Also, "D. mindanensis" can be distinguished from other species of "Draco" in the Philippines by its larger size (maximum length has been recorded at 105 mm), mode of five ribs supporting its patagium, upward directed nostril, lack of Y-shaped series of scales on forehead, presence of lacrimal bone and dorsal body coloration of pale brown with a slight greenish case in males. In males of this species, the dewlap, or the inflatable loose skin under the throat, is large,
Dennie–Morgan fold in these. The pathophysiology of this sign is not clear. One proposed mechanism is that continuous spasm of the superior tarsal muscle and skin edema could be due to hypoxia from poor circulation. A Dennie–Morgan fold should not be confused with an "allergic shiner", a purple-gray discolouration beneath the lower eyelid. This is related to the accumulation of blood and other fluid in the infraorbital groove resulting from nasal congestion. Dennie–Morgan fold A Dennie–Morgan fold, also known as a Dennie–Morgan line or an infraorbital fold, is a fold or line in the skin below the lower eyelid. It can simply