Final answer:
To investigate occupational contact dermatitis, methods such as patch testing and sample analysis can be used. History-taking and physical examinations are also helpful in identifying contributing factors.
Step-by-step explanation:
To investigate occupational contact dermatitis, various methods can be used. One method is to use patch testing, where different substances are applied to the skin to determine if they cause a reaction. Another method is to collect samples of the skin and analyze them using microbiological methods to identify the cause of the dermatitis. Additionally, history-taking and conducting thorough physical examinations can help in identifying the occupational factors that contribute to contact dermatitis.