 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST] . It works by causing the skin to shed dead cells from its top layer and slow down the growth of skin cells. This effect decreases scaling and dryness. Coal tar can also decrease itchiness from these skin conditions. How to use Tarsum Professional Shampoo Follow all directions on the product package. If you have any questions, ask your doctor or pharmacist. This medication is for use on the hair and scalp only. To avoid irritation, do not let this medication come into contact with your eyes, nose, mouth, groin, or rectum. If you do get the medication in those areas, flush the area with cool water for 15 minutes. Wash hands after use. Do not apply to broken or infected skin unless directed by your doctor. Wet hair/scalp thoroughly. Apply a generous amount of coal tar shampoo and massage into a lather. Allow lather to remain on scalp for several minutes. Rinse thoroughly and repeat. To help keep this product out of your eyes, keep eyes closed while shampooing. Protect eyes with a washcloth or towel. Use this product usually twice a week or as directed by your doctor. Dosage is based on your medical condition, your product type/brand, and response to treatment. Do not use large amounts </s>