<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi doctor, Ive been experiencing red, scaly patches on my skin for a while now. I believe its psoriasis. What tests do I need to have done?  <response>: Based on your symptoms, you will need a complete physical skin exam performed, as well as a biopsy and excision of any suspicious skin lesions. Additionally, we will need to perform a lipid panel to check your cholesterol levels. Depending on the severity of the psoriasis, we may recommend other therapeutic procedures or other diagnostic procedures on your skin and subcutaneous tissue. 