Ultitar CS Lotion is a combination medicine used to treat psoriasis. Additionally, Ultitar CS Lotion may also be used to treat seborrheic dermatitis. Psoriasis is a skin condition in which skin cells multiply up to 10 times faster than usual, leading to skin build-up into bumpy (uneven) red patches covered with white scales. Seborrheic dermatitis is a skin condition which causes an itchy rash with flaky scales.