Final answer:
Erythema is the skin appearance that results from dark-red hemoglobin. It is characterized by redness or rash on the skin caused by increased blood flow to the area.
Step-by-step explanation:
The skin appearance that results from dark-red hemoglobin is called erythema. Erythema is a redness or rash on the skin caused by increased blood flow to the area. When hemoglobin is oxygenated, it appears bright red, but when deoxygenated, it appears dark red, which can contribute to the appearance of erythema. An example of erythema is the redness that occurs when you have a sunburn.