Scorch burns are third-degree burns of thermal burns, according to the highest degree of burns. The injury reaches the whole skin layer, and can even reach deep into the subcutaneous, muscle and bone. The skin is necrotic and dehydrated and can form a scorched scab, which is like leather to the touch, or has even charred. Burns can be caused by hot water, steam, flame, electric current, laser, radiation, acid, alkali, phosphorus and other factors. What is commonly referred to or narrowly defined as a burn is a thermal burn caused solely by heat and is common in clinical practice. Burns caused by other factors are referred to as etiologic, such as electrical burns, chemical burns, and so on. So how do you determine the degree of burns in crusted burns? Examination Injury to the whole layer of the skin, and even deep into the subcutaneous, muscle, bone and so on. Skin necrosis and dehydration can form a crust, so it is also known as crust burns. The wound surface is without blisters, waxy white or burnt yellow, or dendritic embolized blood vessels can be seen; it is like leather when touched; it is even charred. Sensation disappears; skin temperature is low. Natural healing is very slow, have to hold the crust off, granulation tissue growth and then the formation of scar, only the edge of the epithelium, not only the loss of skin function and often lead to deformity some wounds are even difficult to self-healing. Differential diagnosis Severe burns: severe burns refer to life-threatening severe burns, charring of tissues. Extra-severe burns: extra-severe burns refers to the area of 51% or more than 21% of the area of degree III, seriously endangering the patient’s life, such as early (within 48h after the injury) improper treatment, will greatly increase the mortality and disability rate.