Contact urticaria: a different contact dermatitis.
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Biomedical subjects
Publications and source records attributed to R B Odom.
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An atypical fibroxanthoma on the ear of a 82-year-old man appeared clinically as a pyogenic granuloma. Histopathologically, the lesion had been interpreted as a malignant melanoma before its true nature was identified. Familiarity with this cutaneous pseudomalignant growth is essential to prevent radical surgical procedures.
Strongyloides stercoralis causes a distinctive form of cutaneous larva migrans that is recognized as larva currens. The rapid rate of intracutaneous migration, the cutaneous localization, the chronicity of recurrence, and the frequency of urticarial reaction justify its presentation as a clinically distinguishable form of creeping eruption. This clinical complex should be identified as a cutaneous sign of systemic disease.
Cobalt chloride should be added to the ever growing list of contact urticants. This chemical is frequently used as a color indicator in provocative sweat testing. In this case, contact urticaria was probably nonimmunologic in origin. Since diphenhydramine and 48-80 (polymonine block this reaction to cobalt chloride, vasoactive amines are at least partially responsible for the urticaria.
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