TY - CHAP M1 - Book, Section TI - Nummular Eczema, Lichen Simplex Chronicus, and Prurigo Nodularis A1 - Silverberg, Jonathan I. 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. Y1 - 2019 N1 - T2 - Fitzpatrick's Dermatology, 9e AB - AT-A-GLANCENummular eczema:Also known as nummular dermatitis and discoid eczema.A chronic inflammatory skin disorder of unknown etiology.Papules and papulovesicles coalesce to form nummular plaques with oozing, crust, and scale.Most common sites of involvement are upper extremities in men and women, particularly the dorsal hands in women, and the lower extremities in men.Pathology may show acute, subacute, or chronic eczema.Lichen simplex chronicusA chronic, severely pruritic disorder characterized by one or more lichenified plaques.Most common sites of involvement are scalp, nape of neck, extensor aspects of extremities, ankles, and anogenital area.Pathology consists of hyperkeratosis, hypergranulosis, psoriasiform epidermal hyperplasia, and thickened papillary dermal collagen.Prurigo nodularisAlso known as prurigo, picker’s nodules, or nodular prurigo of Hyde.A pruritic disorder that runs a chronic course.Hyperkeratotic firm nodules vary in size from 0.5 to 3.0 cm and may be excoriated.Associations include atopic dermatitis and systemic causes of pruritus.Pathology consists of hyperkeratosis, hypergranulosis, psoriasiform epidermal hyperplasia, thickened papillary dermal collagen, and characteristic neural hypertrophy. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/10/06 UR - accessmedicine.mhmedical.com/content.aspx?aid=1161322374 ER -