[Occupational allergic contact dermatitis in Dakar]

Occupational dermatitis, mainly allergic contact dermatitis and skin irritations are increasing because of new allergens and diversity of the industrial procedures. In Senegal occupational contact dermatitis are currently observed and they are not declared at our social security institution. The aim of our trial was to determinate the frequency of occupational allergic contact dermatitis, the allergens responsible and the exposed occupations. We included in a one year lasting prospective trial, all patients with occupational contact dermatitis confirmed by positive cutaneous allergological tests. Among 201 cases of contact dermatitis, 27 (12,91%) were included and predominant occupational sectors were building, mechanics, health, cleaning and trade. Main responsible allergens were dichromate of potassium (7), N-isopropyl N-phenylparaphenylenediamine (3), fragrance mix (3), thiuram mix (3), colophane (3), formaldehyde (2), nickel sulphate (2), Chalk (2). Building sector was the most frequent source because of high use of dichromate of potassium in cement and formaldehyde in painting-glue. In mechanics, N-isopropyl N-phenylparaphenylenediamine is present in rubbers and fragrance mix in oils. Occupational dermatitis in health workers are due to presence of thiuram mix in the gloves, and dichromate of potassium found in antiseptics. To decrease the incidence of occupational contact dermatitis in our country, we have to promote prevention among workers by using individual protective outfits and increasing workers medical survey and information about risks and means of prevention.