RT Book, Section A1 Bruckner, Anna L. A2 Kang, Sewon A2 Amagai, Masayuki A2 Bruckner, Anna L. A2 Enk, Alexander H. A2 Margolis, David J. A2 McMichael, Amy J. A2 Orringer, Jeffrey S. SR Print(0) ID 1161331064 T1 Keratosis Pilaris and Other Follicular Keratotic Disorders T2 Fitzpatrick's Dermatology, 9e YR 2019 FD 2019 PB McGraw-Hill Education PP New York, NY SN 9780071837798 LK accessmedicine.mhmedical.com/content.aspx?aid=1161331064 RD 2024/10/11 AB This chapter discusses conditions with the common finding of follicular keratosis, defined as orthokeratosis of the follicular ostium and infundibulum. Keratotic plugs protrude from the orifices, producing a rough sensation on palpation of the skin. Keratosis pilaris (KP) is a common, benign form of follicular keratosis; less common variants are associated with follicular inflammation, atrophy, scarring, alopecia, and in rare cases noncutaneous abnormalities. Trichodysplasia spinulosa (TS), a recently described, virally induced follicular dysplasia with similar findings, is also reviewed.