pityriasis rubra pilaris
noun
pityriasis ru·bra pi·lar·is
-ˈrü-brə-pi-ˈlar-əs 
: a chronic dermatitis characterized by the formation of papular horny plugs in the hair follicles and pinkish macules which tend to spread and become scaly plaques
Cite this Entry
“Pityriasis rubra pilaris.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/pityriasis%20rubra%20pilaris. Accessed 23 Jul. 2025.
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