1st degree (superficial burns): Reddened skin without blisters.
2nd degree (partial thickness burns): Reddened skin with blisters (heals from bottom up; takes 2-3 weeks).
3rd degree (full thickness burns): Deep burns with white or charred skin – The area also loses sensation to pain and touch; usually needs a skin graft to prevent bad scarring if it is larger than a quarter in size.
Caused by external heat sources that raise the temperature of the skin and tissues, these burns cause tissue cell death or black charring. Hot metals, scalding liquids, steam and flames can cause thermal burns.
Frostbite is a type of burn caused by extreme cold. In frostbite, body tissue becomes frozen, and permanent damage may happen if not treated promptly. Amputation may be needed in the most severe cases. Most commonly, affected body parts include the nose, ears, fingers, toes, cheeks and chin.
Stevens-Johnson syndrome and toxic epidermal necrolysis are two forms of the same life-threatening skin disease that cause rash, skin peeling and sores on the mucous membranes. They are commonly caused by drugs or infections.
Necrotizing of soft tissue, commonly known as flesh-eating disease , is an infection that causes the death of parts of the body's soft tissue. It is a severe disease that spreads rapidly. Symptoms include red or purple skin in the affected area, severe pain, fever and vomiting. A necrotizing soft tissue infection can destroy skin, muscle and other soft tissues. If untreated, it may lead to amputation and sometimes death.