Final answer:
First-degree burns are superficial burns that only affect the epidermis, causing redness and pain. They do not result in blisters or white or charred skin, and there is no loss of sensation.
Step-by-step explanation:
A first-degree burn is a superficial burn that affects only the epidermis. It is characterized by redness and pain. The skin may be swollen, but it does not form blisters or show any white or charred appearance. There is also no loss of sensation in the affected area.