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It is important to procure good quality masks made of cotton material which is less irritating. It is unlikely that several workers in one workplace will have an allergic type reaction to the cloth mask. However, irritant reactions are possible thus it is important to obtain good quality masks. If the worker has a history of allergies which should be in their medical file, this will be another clue of whether the condition is new or was existing before. Surgical masks can be used if cloth mask are a problem.