violaceous

Note the thick, violaceous, hyperkeratotic plaque with a white, lacelike pattern on the surface (Wickham's striae).

WordNet

a family of order Parietales including the genera Viola, Hybanthus, Hymenanthera, Melicytus (同)family Violaceae, violet family

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Fueyo-Casado A, Campos-Munoz L, Lopez-Bran E.SourceServicio de Dermatologia, Hospital Clinico San Carlos, Madrid, Espana.
Actas dermo-sifiliograficas.Actas Dermosifiliogr.2011 Oct;102(8):629-630. Epub 2011 May 13.
PMID 21570671

Nests with numerous SOX10 and MiTF-positive cells in lichenoid inflammation: pseudomelanocytic nests or authentic melanocytic proliferation?

Silva CY, Goldberg LJ, Mahalingam M, Bhawan J, Wolpowitz D.SourceDepartment of Dermatology, Dermatopathology Section, Boston University School of Medicine, Boston, MA, USA.
Journal of cutaneous pathology.J Cutan Pathol.2011 Oct;38(10):797-800. doi: 10.1111/j.1600-0560.2011.01756.x. Epub 2011 Aug 4.
Pseudomelanocytic nests in the setting of lichenoid inflammation can mimic atypical melanocytic proliferations. Both melanocytic and cytokeratin immunohistochemical stains may be utilized to differentiate these entities. Unlike true melanocytic nests, pseudomelanocytic nests contain Melanoma Antigen
PMID 21812802

Bizarre-looking violaceous nodular plaque on the hands : Unusual presentation of peripheral T-cell lymphoma, not otherwise specified

Cytophagic Histiocytic Panniculitis Improved by Combined CHOP and Cyclosporin A Treatment

ITO Masayuki,OHIRA Hiromasa,MIYATA Masayuki,SUZUKI Tomohiro,SATO Yukio,KAISE Shunji,NISHIMAKI Tomoe,SAKUMA Hiroshi,NIHEI Yoshimichi,IWATSUKI Keiji,KASUKAWA Reiji
Internal medicine 38(3), 296-301, 1999-03
… He was admitted to our hospital in January 1994 with recurrent high fever of 40.2° and tender and violaceous subcutaneous nodules on his trunk, arms and legs. …
NAID 10005896884