“…The largest series so far published, also of seven patients, and was presented by Hannuksela et al (1976). In previously reported cases the ulcers healed leaving either hyperpigmented scars (Rycroft, 1980;Buckley, 1982) or depigmented areas (Vickers & Edwards, 1976). In others skin grafting was required (Rowe & Williams, 1963;Fisher, 1979;Buckley, 1982).…”