A first-degree burn is the mildest type of burn, affecting only the outer layer of skin, known as the epidermis. It typically results from brief exposure to heat, such as touching a hot surface or sunburn. Symptoms include redness, minor swelling, and pain, but the skin usually remains intact without blisters. Treatment for a first-degree burn often involves cooling the area with running water and applying soothing lotions or aloe vera. These burns usually heal within a few days without scarring. However, if symptoms worsen or do not improve, it is advisable to seek medical attention.