Sulfur8 Scalp Therapy Soothing Treatment is a medicated, leave-in treatment. Use this Salicylic Acid formula for relief of scalp itching, irritation, redness, scaling and flaking associated with dandruff, seborrheic dermatitis and psoriasis. This Soothing Treatment can be used after shampooing your hair or between shampoos. Just simply apply to the affected area on your scalp one to four times daily for a cooling sensation and relief from an itchy scalp.