Flip-flops and latches are used as data storage elements. A flip-flop stores a single bit (binary digit) of data; one of its two states represents a one and the other represents a zero. Such data storage can be used for storage of state, and such a circuit is described as sequential logic.
1 Incisional hernia can occur through a scar if you have had abdominal surgery in the past. 2  Umbilical hernia is a bulge around the belly button. 3  It occurs when the muscle around the belly button does not close completely after birth.
Both of these kinds of scars are more common in younger and dark-skinned people. Some scars can have a sunken or pitted appearance. This kind of scarring occurs when underlying structures supporting the skin (for example, fat or muscle) are lost. Some surgical scars have this appearance, as do some scars from acne. Scars also can appear as stretched skin. Such scars result when the skin stretches rapidly (for example, as in growth spurts or during pregnancy). In addition, this type of scar can occur when the skin is under tension (near a joint, for example) during the healing process.