Queloides são encontrados apenas em humanos e ocorrem em 1% a 16% da população, com diferenças significativas entre etnias.[2]Limandjaja GC, Niessen FB, Scheper RJ, et al. The keloid disorder: heterogeneity, histopathology, mechanisms and models. Front Cell Dev Biol. 2020;8:360.
https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2020.00360/full
http://www.ncbi.nlm.nih.gov/pubmed/32528951?tool=bestpractice.com
Os queloides são mais comuns em indivíduos afrocaribenhos, com uma incidência estimada de 5% a 10%.[3]Huang C, Wu Z, Du Y, Ogawa R. The epidemiology of keloids. In: Téot L, Mustoe TA, Middelkoop E, et al., eds. Textbook on scar management: state of the art management and emerging technologies [Internet]. Cham: Springer; 2020.
https://www.ncbi.nlm.nih.gov/books/NBK586088
http://www.ncbi.nlm.nih.gov/pubmed/36351127?tool=bestpractice.com
Alguns estudos relatam aumento da prevalência em indivíduos asiáticos, em comparação com indivíduos brancos.[4]Ung CY, Warwick A, Onoufriadis A, et al. Comorbidities of keloid and hypertrophic scars among participants in UK biobank. JAMA Dermatol. 2023 Feb 1;159(2):172-81.
https://jamanetwork.com/journals/jamadermatology/fullarticle/2800120
http://www.ncbi.nlm.nih.gov/pubmed/36598763?tool=bestpractice.com
[5]Tulandi T, Al-Sannan B, Akbar G, et al. Prospective study of intraabdominal adhesions among women of different races with or without keloids. Am J Obstet Gynecol. 2011 Feb;204(2):132.e1-4.
https://www.ajog.org/article/S0002-9378(10)01131-2/fulltext
http://www.ncbi.nlm.nih.gov/pubmed/20974460?tool=bestpractice.com
No entanto, a incidência relatada é similar no Japão (0.1%) e Inglaterra (0.09%).[3]Huang C, Wu Z, Du Y, Ogawa R. The epidemiology of keloids. In: Téot L, Mustoe TA, Middelkoop E, et al., eds. Textbook on scar management: state of the art management and emerging technologies [Internet]. Cham: Springer; 2020.
https://www.ncbi.nlm.nih.gov/books/NBK586088
http://www.ncbi.nlm.nih.gov/pubmed/36351127?tool=bestpractice.com
Acredita-se que homens e mulheres sejam igualmente afetados. A idade média inicial é de 10-30 anos.[6]Bayat A, Arscott G, Ollier WE, et al. Keloid disease: clinical relevance of single versus multiple site scars. Br J Plast Surg. 2005 Jan;58(1):28-37.
http://www.ncbi.nlm.nih.gov/pubmed/15629164?tool=bestpractice.com