玫瑰糠疹的发病率和患病率尚不清楚。有人估计发病率约为 170 例/100,000人,[4]Chuh A, Lee A, Zawar V, et al. Pityriasis rosea - an update. Indian J Dermatol Venereol Leprol. 2005;71:311-315.http://www.ijdvl.com/article.asp?issn=0378-6323;year=2005;volume=71;issue=5;spage=311;epage=315;aulast=Chuhhttp://www.ncbi.nlm.nih.gov/pubmed/16394453?tool=bestpractice.com[9]Chuh A, Chan H, Zawar V. Pityriasis rosea - evidence for and against an infectious aetiology. Epidemiol Infect. 2004;132:381-390.http://www.ncbi.nlm.nih.gov/pubmed/15188706?tool=bestpractice.com在 10-29 岁人群中的患病率为 0.6%。[4]Chuh A, Lee A, Zawar V, et al. Pityriasis rosea - an update. Indian J Dermatol Venereol Leprol. 2005;71:311-315.http://www.ijdvl.com/article.asp?issn=0378-6323;year=2005;volume=71;issue=5;spage=311;epage=315;aulast=Chuhhttp://www.ncbi.nlm.nih.gov/pubmed/16394453?tool=bestpractice.com虽然已有报道PR可发生于从婴儿到老人的所有年龄组中,[3]Trager JD. What's your diagnosis? Scaly pubic plaques in a 2-year-old girl - or in an "inverse" rash. J Pediatr Adolesc Gynecol. 2007;20:109-111.http://www.ncbi.nlm.nih.gov/pubmed/17418397?tool=bestpractice.com[10]Bukhari I. Pityriasis rosea with palmoplantar plaque lesions. Dermatol Online J. 2005;11:27.http://escholarship.org/uc/item/8gw809n1http://www.ncbi.nlm.nih.gov/pubmed/15748568?tool=bestpractice.com但 75% 的病例为 10-35 岁的患者。[4]Chuh A, Lee A, Zawar V, et al. Pityriasis rosea - an update. Indian J Dermatol Venereol Leprol. 2005;71:311-315.http://www.ijdvl.com/article.asp?issn=0378-6323;year=2005;volume=71;issue=5;spage=311;epage=315;aulast=Chuhhttp://www.ncbi.nlm.nih.gov/pubmed/16394453?tool=bestpractice.com[7]Gonzalez LM, Allen R, Janniger CK, et al. Pityriasis rosea: an important papulosquamous disorder. Int J Dermatol. 2005;44:757-764.http://www.ncbi.nlm.nih.gov/pubmed/16135147?tool=bestpractice.com[11]Stulberg DL, Wolfrey J. Pityriasis rosea. Am Fam Physician. 2004;69:87-91.http://www.aafp.org/afp/2004/0101/p87.htmlhttp://www.ncbi.nlm.nih.gov/pubmed/14727822?tool=bestpractice.com该病在女性中更为常见,男女比率为 1:1.43。[4]Chuh A, Lee A, Zawar V, et al. Pityriasis rosea - an update. Indian J Dermatol Venereol Leprol. 2005;71:311-315.http://www.ijdvl.com/article.asp?issn=0378-6323;year=2005;volume=71;issue=5;spage=311;epage=315;aulast=Chuhhttp://www.ncbi.nlm.nih.gov/pubmed/16394453?tool=bestpractice.com[9]Chuh A, Chan H, Zawar V. Pityriasis rosea - evidence for and against an infectious aetiology. Epidemiol Infect. 2004;132:381-390.http://www.ncbi.nlm.nih.gov/pubmed/15188706?tool=bestpractice.com该病罕有复发,据报道复发率为 2.8%,常见于免疫抑制的人群中。[9]Chuh A, Chan H, Zawar V. Pityriasis rosea - evidence for and against an infectious aetiology. Epidemiol Infect. 2004;132:381-390.http://www.ncbi.nlm.nih.gov/pubmed/15188706?tool=bestpractice.com