Keloid scar is a firm, smooth, hard growth following scar formation. It is raised from the surface of the skin. It can develop in early (days) or later (weeks to months) stages of scar formation.
The exact reason for their formation remains unclear though evidence would sho that keloid scars form more readily on darker than lighter skin.
They are not contagious or cancerous.
Keloid scars generally settle with time or treatment however treatment may prove resistant with further keloid forming.
Treatment options include emollients, silicone gel, pressure dressings and surgical excision. Steroid injections into the lesion, laser therapy and cryotherapy may also be used.
DermNet NZ Keloid and hypertrophic scar Author: A/Prof Amanda Oakley, Dermatologist, Hamilton, New Zealand, 1997. Updated September 2014.
NHS Keloid Scars: https://www.nhs.uk/live-well/healthy-body/keloid-scars/