When one cracks a knuckle, the stretching of the capsule lowers the pressure inside the joint and creates a vacuum which is filled by the gas previously dissolved in the synovial fluid. This creates a âbubbleâ which then bursts producing the characteristic âpoppingâ or âcrackingâ sound.
DOCTORS: Click here for the Professional Version. Burns are injuries to tissue that result from heat, electricity, radiation, or chemicals. Burns cause varying degrees of pain, blisters, swelling, and skin loss. Deep, extensive burns can cause serious complications, such as shock and severe infections. Small, shallow burns may need only to be kept clean and to have an antibiotic cream applied.
The most common things you may notice at first are skin redness, pain, and swelling. The pain and swelling may be mild and your skin may start to peel after a day or so. In contrast, second-degree burns blister and are more painful due to an increased depth of the burn wound. For a first-degree burn that occurs in larger areas of your skin, you may experience an increased level of pain and swelling.