Objective To understand and analyze the contact allergens and their characteristics in patients with dermatitis and eczema in Suzhou Industrial Park. Methods A total of 102 patients with dermatitis and eczema skin diseases who were treated in the dermatology clinic of our hospital from August 2021 to October 2023 were selected as the research objects. The patch test diagnostic box was used to analyze the contact allergens of the patients. Results Among 102 patients with dermatitis and eczema, the positive rate of patch test was 43.13%. The positive rate from high to low was nickel sulfate (21.57%), cobalt chloride (16.67%), potassium dichromate (15.69%), nickel chloride (13.73%), fatty acid sodium sulfate (13.73%), etc. There was no significant difference in the positive rate of patch test between male and female patients (P >0.05). Conclusion Nickel sulfate, cobalt chloride, potassium dichromate, nickel chloride and fatty acid sodium sulfate are the main contact allergens in patients with dermatitis and eczema in Suzhou Industrial Park.