Burns and scalds are injuries caused by heat from hot liquids, surfaces, or vapors. They range from minor first-degree burns affecting just the outer skin layer to severe third-degree burns penetrating all skin layers. Treatment depends on burn severity but generally involves cooling the burn, applying antibiotic ointment or sterile dressings, and taking pain medication. More serious burns require medical care to prevent infection and promote proper healing. Sunburn is also a type of burn caused by overexposure to UV rays from the sun and should be treated by hydrating skin and protecting it from further sun exposure.