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FiG. 3. The central part of the same lesion showing an almost aeelhilar and avascular scar 

 which is hyalinized and undergoing Ij-sis. Note the disappearance of the basal epidermal layer, 

 the blistering below it in the centre and the folding of the basement membrane at the periphery. 

 Periodic acid-Schiff. X 100. 



Fig. 4. A iHTiphcral section of the same lesion showing a small hyperkeratotic lesion and, at 

 its base, the invasion of the dermis I)y malignant epidermal cells. ffaematoxyhn-Eosin. X 65. 



