Background. Allergic contact dermatitis (ACD) is one of the most common occupational skin diseases after irritant contact dermatitis (ICD). One of the factors causing ACD is not using personal protective equipment (PPE) and a long working period. This study aimed to analyze the relationship between PPE use behavior and working period with ACD symptoms in workers at the Mabar shrimp factory, Medan. Method. Cross-sectional research with a consecutive sampling method. Assessment of PPE use behavior and working period used a questionnaire and ACD symptoms by a doctor. The analysis used was univariate and bivariate analysis with chi-square. Results. The total number of samples that met the inclusion and exclusion criteria of the study was 100 people, 28 people had symptoms of ACD, enough knowledge, good attitudes, and unfavorable actions with a working period of >2 years. Statistical analysis showed a relationship between PPE use behavior and working period with ACD symptoms. Conclusion. All behavioral factors (knowledge, attitude, and action) and working period have a significant relationship with ACD symptoms