GENERAL HISTOLOGY

Detailed explanation-1: -First-degree burns affect only the outer layer of the skin. They cause pain, redness, and swelling. Second-degree burns affect both the outer and underlying layer of skin. They cause pain, redness, swelling, and blistering.

Detailed explanation-2: -Burn levels first-degree burns: red, nonblistered skin. second-degree burns: blisters and some thickening of the skin. third-degree burns: widespread thickness with a white, leathery appearance.

Detailed explanation-3: -First-degree (superficial) burns. First-degree burns affect only the outer layer of skin, the epidermis. The burn site is red, painful, dry, and has no blisters. Mild sunburn is an example. Long-term tissue damage is rare and often consists of an increase or decrease in the skin color.