Fig. 1

a An erythematous, calloused, crusted left lower lip ulcerative plaque in patient 1. b A round shiny and red colored nodular lesion with hard consistency in the right inferior lip of patient 2. c An erythematous, edematous, and elliptical ulcerative plaque of the left upper lip with overlying yellow crusting lesion extending to the wet line in patient 3. d Sore swelling, with well-defined edges and scaling, involving the left side of the upper lip in patient 4. e A deep red-colored ulcer covered with mild hemorrhagic crusts and severe swelling of the lower lip in patient 5. f Mild swelling of the superior lip, in addition to ulceration, yellow crusting, scaling and bleeding in patient 6. g A severe swelling cheilitis, with crusting, scaling and fissuring lesion of the right superior lip in patient 7