In 1960 formaldehyde resins, used as finish in textiles, were responsible for 50% of the formaldehyde eczemas in Denmark. From 1952 to 1960 the incidence of formaldehyde eczema has been rising only as a consequence of the textile eczemas, while the eczemas from formaldehyde containing anhidrotics have disappeared. Formaldehyde resins are so important in textile industry that a prophylaxis via the manufacturing process seems very difficult. A screen test with chromotropic acid has been used to demonstrate formaldehyde content in pieces of clothing and to guide the patients future purchase of textiles. Problems in diagnostic testing are discussed. The tuberculin type reaction is demonstrable, but not applicable.