<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I am experiencing red and itchy rashes on my scalp and face. I have been diagnosed with seborrheic dermatitis, what tests do I need to take?  <response>: For your condition, we need to do a complete physical skin exam performed, possibly followed by a biopsy, excision, or other therapeutic procedures. It would also be a good idea to refer you to a home health care service for further care. 