• Characteristic 4p’s- purple, polygonal,, pruritic, papule- characteristic Cutaneous lesions
• Wickhams striae
• The classic appearance of skin lesions consists of erythematous to violaceous papules that are flat topped and occasionally polygonal in form. A network of white lines often overlies the papules.
• Koebners phenomena- it refers to development of papules along the line of trauma in a linear fashion. Most commonly seen on skin.
• Penogingival syndrome- male analog of vulvovaginal gingival syndrome- rare in males
• vulvovaginal gingival syndrome- Association of Vulva, vagina & gingiva as the
• Lichen planopilaris is the involvement of the scalp & hair follicles by lichen planus which results in scarring alopecia
• Symptoms like burning, pain, vaginal discharge- erosive & erythematous types

HISTOPATHOLOGY

• Hyper orthokeratinisation or hyper parakeratinisation
• Thickening of granular layer
• Acanthosis of spinous layer
• Intercellular oedema in spinous layer
• “ Saw-tooth” rete pegs
• Liquefaction necrosis of basal layer- Max Joseph cleft space
• Civatte ( hyaline or cytoid) bodies
• Juxta epithelial band of inflammatory cells
• An eosinophilic band may be seen just beneath the basement membrane and represent fibrin covering lamina propria