<prompt> Apple jelly nodules are seen in:Ichthyosis vulgarisLichen planusLupus vulgarisLupus erythematous  <response>: Ans: C Lupus vulgaris Ref: Principles of Diagnosis in Dermatology. In: Thappa DM. editor. Essentials in Dermatology, 2ndedn., New Delhi: Jaypee Brothers Medical Publishers P Ltd 2009:16-30 Mycobacterial Diseases. In: James WD, Berger TG Elston DM, editors. Andrew s Diseases of the Skin: Clinical Dermatology. 11th edn., Saunders Elsevier 201 ; 322-33Explanation:Lupus vulgaris is a type of progressive cutanetms t uberculosis.Occurs in people with moderate to high immunity.Single plaque composed of grouped redbrow n papules with peripheral extension on one side and scarring on the other side.On diascopy of active edge-translucent pale brownish yellow or apple jelly colour in the periphery - apple jelly nodules - granulomatous nodules.Diascopyvitropression:Compression with a glass slide useful in.Differentiating purpura no blanching from erythema blanches.Differentiating nevus anemicus margins blurred from nevus depigmentosus no change. 