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Protein contact dermatitis is a skin condition not well known and underdiagnosed by dermatologists, resulting from an IgE-mediated allergic reaction. Clinically it presents as a chronic hand and/or forearms eczema of occupational origin, especially in professionals who work as food handlers. Epicutaneous tests are negative, and to diagnose this condition it is necessary to perform immediate-type allergy tests. The most sensitive and practical is the prick-by-prick test with food that the patient refers to cause intense itching after immediate skin contact. Treatment is symptomatic, and it is mandatory to avoid the responsible allergen, wearing plastic gloves and even sometimes leaving the workplace for symptom resolution.

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ResumenDesde el siglo V a.C. Hipócrates ya describía las afectaciones ungueales, las cuales luego se relacionaban con enfermedades sistémicas o adquiridas. Los médicos de medicina del trabajo se deben preparar para detectar las afectaciones por factores externos. Sin embargo son pocos los casos publicados sobre patología ungueal de origen ocupacional.Nuestra revisión consiste en brindar conocimientos básicos sobre esta asignatura. Desde su definición, función y la descripción de su anatomía. La patología ungueal la clasificaremos según: a) anomalías de: la forma, de la adhesión, de la coloración, superficie, infección; b) según el mecanismo de acción que se producen o c) según el tipo de ocupación.Al adquirir estos conocimientos podremos establecer posteriores pautas de prevención eficaces. Med Segur Trab (Internet) 2012; 58 (229) 321-326Palabras clave: Patología ungueal, lúnula, uña traumática, matriz ungueal, onicodistrofia lamelar. AbstractFrom the V century B.C. Hippocrates described the damages in the nails, which then were related to systemic diseases or acquired. As physicians we must prepare work to detect the effects caused by external factors. However, few published cases of occupational origin nail pathology. Our review is to provide basic knowledge on this subject. From its definition, function and description of the anatomy. The nail pathology classify as: a) anomalies: the way of accession, coloration, surface, infection, b) according to the mechanism of action that occur oc) by type of occupation. By acquiring this knowledge we can establish effective prevention guidelines later.