What defines a partial thickness burn (second degree)?

A partial thickness burn, also known as a second-degree burn, is characterized by damage that extends through the epidermis and into the dermis, but does not destroy all layers of the skin. The defining features of a partial thickness burn include redness, swelling, and the presence of blisters. These blisters are a significant characteristic, as they indicate that the skin remains intact to some degree, holding moisture beneath the surface and preventing complete destruction of the skin layers.

The redness associated with a partial thickness burn is due to increased blood flow to the area in response to injury and inflammation. This increased blood flow helps in the healing process and is part of the body's response to tissue damage.

While there may be some pain sensation due to the presence of nerve endings in the dermis, the degree of pain can vary depending on the extent and location of the burn. However, this sensation is not absent, distinguishing it from deeper burns. Thus, the redness and blister formation are critical indicators that confirm the classification of a partial thickness burn.