Itchy polygonal violaceous papules seen in -
LICHEN PLANUS:- Inflammatory T cell mediated auto immune disorder affecting skin, hair,nails and mucous membranes.Four Ps- purple , polygonal and pruritic papule.Classic lesion- small polygonal shaped, and red/ violet, flat topped papule. Surface is slightly shiny/ transparent,and a network of fine,white lines called 'Wickhams striae' or small grey white puncta is also seen. Intense itching seen. Koebner phenomenon seen. IADVL textbook of dermatology, page 1070
Psoriasis
Pemphigus
Lichen planus
Pityriasis rosea
Papulosquamous disorders