Final answer:
Chronic contact dermatitis is characterized by brown, scaly, and lichenified skin, as a result of long-term exposure to an allergen or irritant.
Step-by-step explanation:
The form of contact dermatitis that presents as brown, scaly, and lichenified is considered chronic. This classification is due to the repeated or continuous exposure to an allergen or irritant, which leads to the skin becoming thickened and leathery. The acute form of contact dermatitis is typically characterized by red, inflamed, and blistering skin soon after exposure. In contrast, chronic dermatitis is a result of long-term exposure and the skin's attempt to protect itself by becoming thicker.
The form of contact dermatitis that presents as brown, scaly, and lichenified is chronic contact dermatitis (option b). Chronic contact dermatitis occurs when there is repeated exposure to a particular allergen over a period of time. The skin becomes thickened, brown in color, scaly, and lichenified due to the chronic inflammation.