Any injury to the skin heals by scar formation. A scar is the body's attempt to mend the damaged skin with new growth of collagen. Some scars are thin and barely noticeable, however other scars can become raised and remain red for months or years, while others become sunken. Treatment of scars is possible with injections, additional surgery and laser therapy. A dermatologist will be able to advise the appropriate treatment for a particular scar. Some scars, like burn scars, are susceptible to developing squamous cell carcinoma and should be protected from sunlight and carefully monitored for such changes.