Lichen Planus:
Lichen Planus is the hallmark of lichenoid skin diseases.
-It was described in 1869 by the British Dermatologist Sir Erasmus Wilson
-It is best memorized by using the “5 P’s rule”.
- Papules
- Pruritic
- Purple
- Polygonal
- Planar
-Lesions can be located anywhere but predominate on the wrists
-White streaks called Wickham’s Striae can be seen (more so in the oral mucosa) and are due to increased in thickness of the Granular layer.