Final answer:
Erythema is a symptom of both furuncle and eczema. Furuncle is a localized infection of a hair follicle that causes a painful, red bump, while eczema is an inflammatory skin disorder characterized by dry, itchy patches of skin that become red and inflamed.
Step-by-step explanation:
Erythema is a symptom of both furuncle and eczema. Erythema refers to redness of the skin, which can be observed in both conditions. Furuncle is a localized infection of a hair follicle that causes a painful, red bump, while eczema is an inflammatory skin disorder characterized by dry, itchy patches of skin that become red and inflamed.