<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, Ive been experiencing skin irritation, redness, and itchiness whenever I come into contact with certain substances. I think it might be contact dermatitis. What tests do I need to take to confirm this?  <response>: Based on your symptoms, a complete physical skin exam will need to be performed. Additionally, a biopsy may be necessary to confirm a diagnosis of contact dermatitis. Other diagnostic procedures on the skin and subcutaneous tissue, such as excision of a skin lesion, may also be required. Referral to a home health care service for further evaluation and treatment may also be necessary. Other non-OR therapeutic procedures on the skin and breast and other gastrointestinal diagnostic procedures may be performed to further evaluate your condition. 