Table 1.

Overview of clinical subtypes and rare variants.

Cutaneous lichen planus	•Localized cutaneous lesions of LP •Generalized cutaneous LP •Hypertrophic LP •Palmoplantar LP •Atrophic LP •Actinic LP •Vesiculobullous LP •Annular LP •Erosive and ulcerative LP •Annular LP •LP pigmentosus •Lichen planus pemphigoides •Linear LP •Follicular LP
Mucosal lichen planus	•Oral LP	° LP plaque-like or erosive ° Atrophic LP lesions of the oral mucosa ° Bullous LP of the mucosa
	•Genital LP	° Papular genital LP ° Hypertrophic genital LP ° Chronic erosive LP lesions in genitalia
	•Esophageal LP
	•Laryngeal LP
Appendageal lichen planus	•Lichen planopilaris (LPP)	° Classic form LPP ° Frontal fibrosing alopecia ° Graham-Little-Piccardi-Lasseur Syndrome
	•LP of the nails
Other forms of LP	•Drug-induced lichen planus •Overlap syndromes: LP erythematosus •Lichenoid reaction of graft-vs.-host disease •Lichenoid keratosis •Ocular LP •Aural and urethral LP