Final answer:
Dermal exposure occurs when corrosive materials contact the skin, potentially causing severe damage or absorption into the bloodstream.
Step-by-step explanation:
A corrosive material that damages the skin or body tissue is considered exposure by dermal contact. When corrosive chemicals come into contact with skin, they can cause burns, or be absorbed through the skin into the bloodstream. Corrosive substances such as hydrochloric acid can damage living tissues by decomposing proteins and lipids upon contact, which can lead to chemical burns or other forms of tissue damage. Protective measures like wearing gloves and other protective clothing are essential when handling such substances to prevent dermal exposure.