Keloids form due to the overgrowth of scar tissues. When the skin is wounded, scar tissues form to cover the wound for protection. Occasionally, these scar tissues grow excessively to form keloids which are smooth, hard formations, slightly elevated and reddish purple in colour.
Keloids can be much larger than the wound, irregular in shape, and tend to enlarge progressively. They don’t fade away like scars. They can appear anywhere on the skin that suffers a wound, but are usually found on the chest, shoulders, earlobes, and cheeks.
Doctors are unaware of the exact cause of keloids but it may be caused by lack of communication by the cellular signals that control growth and proliferation. It is also understood to be hereditary. Keloids affect both genders, but are less common in elderly and children. People of Asian and African origin are thought to be more susceptible to keloids.