How develops scars

 Scars is an area on skin formed by fibrous tissue.  Scars forming is a process of repairing of damage skin. 

For a certain cause scars may develop.These are injury,  burn, surgery, cutting of skin, any damage on skin.  It is a normal healing process of skin. It replaces the dead skin.  

Scars tissue and skin tissue have some basic difference. Scars tissue is not similar with natural skin or muscular tissue. Scar tissue is can not restrict ultraviolet radiation sufficiently like skin tissue. No hair follicles grows on scar tissue. Hence, sun burn is not safe with scar tissue. Function of scar tissue is also different. Due to myocardial infarction scar tissue develops in heart to repair damaged heart.  For that reason normal function of heart reduces and increases the chance of heart failure. 

There have several types of scar tissue in skin. Flat scars, raised scars. 

Hypertrophic scars raised from the skin. Keloid is the very severe form of scars. It is abnormallly big and raised and forms tumours. But tumours are benign and non cancerous growth. Mostly in dark skin people keloid scars are found.