A scald is an injury produced by the application of a liquid at or near its boiling-point.
Appearances as Indicating Origin.
A hot body may produce a burn of any intensity, ranging between reddening of the skin and complete charring of the tissues, according as its temperature is elevated and the period of contact prolonged: the shape of the object and its size being indicated by the form of the burn. Metallic substances heated to a temperature of 100° C. (212° F.) are capable of producing redness and vesication and other injurious effects. At this temperature the albuminous elements of the blood and other fluids undergo coagulation. Some bodies require to be heated to redness, or nearly so, in order to produce a defined burn.
Very hot and partially-fused solids cause burns of greater severity than where the heated body is of a character favoring prompt removal. In such cases their adhesion to the skin involves the tearing away of the superficial portions of the derma in their removal, or they by their adherence prolong the contact of the heated body, thus intensifying their destructive action.
Metals in a state of fusion produce burns which cannot be easily distinguished from those caused by solid bodies. Such burns are classed as scalds. Their effects may vary in any degree between slight redness and complete destruction of the tissues with charring. Burns caused by melted solids are less regular in form and outline than those caused by heated solids. They are usually of greater severity on account of the high temperature to which they have been raised.[700]
Boiling Water.—Scalds by boiling water may be so slight as to produce redness only, or they may be so severe as to cause marked and characteristic symptoms. Those noted in severe cases are an ashy hue of the skin, accompanied by a soaked or sodden appearance and the production of blisters. Occasionally these features are not easily distinguished from those of burns from other sources. Blackening of the skin and charring of the tissues never result from burns by boiling water. As in all burns, a large surface involved renders an early fatal issue probable. In severe cases, not necessarily fatal, gangrene of the parts injured sometimes occurs. Most of those met with are accidental, yet cases of scalding by hot water with intent to injure are not uncommon, aside from injuries and death resulting from explosion of boilers, bursting of steam-pipes, etc. Occasional instances are recorded of death of children, the insane or feeble persons by inadvertent immersion in a bath of hot water (Case 21).
Severe and fatal burns of the mouth, fauces, and larynx in young children occur from inhaling steam or swallowing boiling water from a teapot or kettle in an attempt to drink (Case 5).
Burns by burning oil produce effects and appearances similar to those by melted metals.
Burns by flame are specially characterized by scorching of the surface. Hairs upon the part actually burned are scorched and usually also those in the vicinity of the burned patches. Such conditions could not result from scalds by hot water, boiling oil, or from a hot body only.
Burns by petroleum or its derivatives resemble the burns from flame, except that the injured portions of the body are not only scorched but blackened and are usually burned more severely than by flame alone, as the clothing holds the burning substance in contact with the parts. The odor of the agent is also very noticeable.