“…The lesions of CPD are primarily perilabial (Slagsvold, 1938;Roncero et al, 1987;Zanin et al, 1987;Housawi et al, 1991) involving oral commissures (Kummeneje and Krogsrud, 1979;Nooruddin and Barik, 1989;Hussain et al, 1992), lips Darbishire, 1961;Kater and Hansen, 1962;Gardiner et al, 1967;Verdes et al, 1970;Obi and Gibbs, 1978;Valder et al, 1979;Rodrignez et al, 1985;Nooruddin and Barik, 1989;Hussain et al, 1992), muzzle (Obi and Gibbs, 1978) and mouth (Darbyshire, 1961;Obi and Gibbs, 1978;Thel and Rudolph, 1981;Hawkins et al, 1991) including oral mucosa (Marsh and tunnicliff, 1937;Darbyshire, 1961;Morales and Van Kruiningen, 1971;Valder et al 1979;Tontis et al, 1981;Ilic et al, 1987;Hawkins et al, 1991), tongue (Thorp, 1943;Chodkowski and Zebrowski, 1952;Darbyshire, 1961;Gardiner et al, 1967;Morales and Van Kruiningen, 1971;Valder et.al., 1979;Theil and Rudolph, 1981;Zanin et al, 1987;Hawkins et al, 1991), gums and dental pad (Gardiner et al, 1991;Hussain et al, 1992)…”