Final answer:
A superficial partial thickness burn affects both the epidermis and a portion of the dermis, resulting in swelling and blistering. Deep partial thickness burns fully extend into the epidermis and dermis, destroying tissue and affecting nerve endings.
Step-by-step explanation:
A superficial partial thickness burn, also known as a second-degree burn, affects both the epidermis and a portion of the dermis. It results in swelling and painful blistering of the skin. If kept clean and sterile to prevent infection, these burns typically heal within several weeks. On the other hand, a deep partial thickness burn, or a third-degree burn, fully extends into the epidermis and dermis, destroying tissue and affecting nerve endings and sensory function. These burns require medical attention and heal slowly without it.