Keloid scars (United Kingdom National Health Service): https://www.nhs.uk/live-well/healthy-body/keloid-scars/
Keloids: Diagnosis and Treatment (American Academy of Dermatology Association): https://www.aad.org/public/diseases/a-z/keloids-treatment
Keloids (Harvard Health Publishing): https://www.health.harvard.edu/a_to_z/keloids-a-to-z
Management of Keloids and Hypertrophic Scars (American Academy of Family Physicians): https://www.aafp.org/afp/2009/0801/p253.html
Keloids: A Review of Etiology, Prevention, and Treatment (National Center for Biotechnology Information, U.S. National Library of Medicine): https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7158916/