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.
There are 3 degrees of burns: 1  First-degree burns are red and painful. 2  They swell a little. 3  They turn white when you press on the skin. 4  The skin over the burn may peel off after 1 or 2 days. 5  Second-degree burns are thicker burns, are very painful and typically produce blisters on the skin.he cool water helps reduce swelling by pulling heat away from the burned skin. Treat the burn with a skin care product that protects and heals skin, such as aloe vera cream or an antibiotic ointment. You can wrap a dry gauze bandage loosely around the burn. This will protect the area and keep the air off of it.