Hypertrophic scars are usually produced because the body has too much collagen in the skin, causing scars to be raised above the level of the rest of the skin. The difference between these and keloids are that they do not grow beyond the outer edges of the original wound, whereas keloids do. However, this type is not seen very often, except where the wounds have had secondary closure.
These scars can appear stiff, purple, pink and/or red. Usually they happen on skin areas which have the most tension and more often in people that have darker skin. As they mature, they can become very sensitive to any sort of physical contact, including something as light as clothing brushing across your skin. They may feel tender, or even itch from time to time. Their heaviness is especially common after a serious wound or having a piercing, but with the appropriate treatment they can be lessened or even fade with time.
Treatments for these types of scars include topical creams, silicon sheets and steroid injections that reduce the collagen production. However, some people confuse it with an infection and try to squeeze it, causing even more damage. All that comes out, if anything, are strands of granulated collagen. A more natural and less damaging method to reduce the scarring is to combine salted water (preferably sea salt without cyanide) and a few chamomile flowers, soaked for half an hour. This is then rubbed on the scar and left for about fifteen minutes, morning, noon and night. After about three days the scar reduces in size, but this is just one of many interesting home type solutions. Another good one is to use tea tree oil, not only because it reduces the size, but cleanses it and has a nice smell, too.
Hypertrophic scars may be rare, but they do run in some families. Some people are definitely more prone than others, but unless the damage done is severe enough, the chances of developing one is slim at best. However, with people with a genetic disposition towards getting them, every effort is necessary to prevent them and this is best done by treating the scarred tissue right from its early days to reduce any collagen growth.