Healing usually takes three to four days. The superficial variety are usually caused by scalds, flash burns or brief contact with hot objects. The more serious, deeper partial-thickness burns are usually caused by flame scalds or hot grease. In both cases, blistering is significant and the burn is typically very painful to the touch. But a second-degree burn is usually not serious unless a large area is affected or a secondary infection develops.
Healing can take up to six weeks.
They involve destruction of the full thickness of the skin and may extend to the underlying tissue, muscles, tendons and bones to become fourth-degree burns. The skin may be blackened, or white and leathery feeling. Typically, the burns are pain-free since nerves have been destroyed. Skin- grafts are usually required. First aid involves easing the pain by flushing the area with cool water.