A<unk>  is an area of fibrous tissue that replaces normal skin after an injury.<unk> s result from the biological process of wound repair in the skin, as well as in other organs, and tissues of the body. Thus,<unk> ring is a natural part of the healing process. With the exception of very minor lesions, every wound (e.g., after accident, disease, or surgery) results in some degree of<unk> ring. An exception to this are animals with complete regeneration, which regrow tissue without<unk>  formation.<unk>  tissue is composed of the same protein (collagen) as the tissue that it replaces, but the fiber composition of the protein is different; instead of a random basketweave formation of the collagen fibers found in normal tissue, in fibrosis the collagen cross-links and forms a pronounced alignment in a single direction. This collagen<unk>  tissue alignment is usually of inferior functional quality to the normal collagen randomised alignment. For example,<unk> s in the skin are less resistant to ultraviolet radiation, and sweat glands and hair follicles do not grow back within<unk>  tissues. A myocardial infarction, commonly known as a heart attack, causes<unk>  formation in the heart muscle, which leads to loss of muscular power and possibly heart failure. However, there are some tissues (e.g. bone) that can heal without any structural or functional deterioration.
Scar
Edema blister
Burn 
Burn
Edema
Injection fibrosis
Heat edema
Oscar 