What is a characteristic of a first degree burn?

A first-degree burn is characterized by redness, increased warmth, and mild pain. This type of burn affects only the outer layer of the skin, known as the epidermis. When the skin is damaged to this extent, it typically exhibits redness due to increased blood flow to the area as a response to injury. The mild pain associated with first-degree burns is a result of inflammation and sensitivity in the skin; however, it is generally manageable and does not involve the intense pain experienced in more severe burns.

In contrast, the other described characteristics relate to more severe burn degrees. Redness and blistering with severe pain would indicate a second-degree burn, while destruction of skin and muscle tissue aligns with third-degree burns, which penetrate deeper layers of skin and damage more structures. Complete numbness in the area of the burn suggests a fourth-degree burn where there is extensive nerve damage. Thus, the features outlined in the correct answer align perfectly with the clinical presentation of first-degree burns.