Final answer:
Dermal thickening is common in response to damage or injury, such as in contact dermatitis and delayed-type hypersensitivity reactions.
Step-by-step explanation:
Dermal thickening is common in the skin in response to damage or injury. One example of this is in contact dermatitis, where the skin thickens in response to exposure to substances like latex. Another example is in delayed-type hypersensitivity reactions, such as the tuberculin reaction, where the skin becomes thickened and inflamed.