CLINICAL CASES - PERFORATING VERRUCIFORM COLLAGENOMA, AN EXOGENOUS INCLUSION-LINKED DERMATOSIS

Introduction. Perforating verruciform collagenoma, first described in 1963, designates papular and keratotic post-trauma lesions which show an aspect of epidermal perforation microscopically with large fragment s of collagen issuing through fistulous chimneys, more or less pycnoti c polynuclears and squamating or necrotic epidermal cells. Three publi cations have presented this diagnosis. Case report. We observed a pati ent with multiple lesions with macroscopic and microscopic presentatio ns suggestive of perforating verruciform collagenoma. The lesions appe ared after scratches and inoculation with calcium chloride. Discussion . This case is similar to those observed after intradermal inoculation of calcium salts. In the 4 previous cases, perforating verruciform co llagenoma was associated with trauma allowing the intradermal penetrat ion of a particular foreign material (glass wool, vegetable debris, dr ugs or intravenous injections, wound caused by a metallic garbage bin) . The exceptional nature of perforating verruciform collagenoma in hig hly frequent skin wounds would suggest that a very particular post-tra uma process is occurring caused by the introduction of an exogenous su bstance within the derma: calcium chloride in our case, a non-specific material in the four previous cases.