For example, a severe burn on the upper arm can cause the skin and tissue to become so tight that the hand does not get the blood flow it should.
To prevent damage to the tissues that are not getting enough blood, surgical incisions are made along the damaged area, which releases the pressure of the swollen tissues and allows blood flow to resume. Because of the swelling of the damaged tissue, the surgical incisions may spread open, showing the tissues and structures beneath the skin.
Any open wound has a risk of infection so the area may be covered in sterile bandages.
Related Surgery Information: Incision Care Made Easy