A moisturizer applied over the tar preparation will decrease the drying effect on the skin. Some patients prefer a tar compounded in an ointment or cream base. To increase compliance with use, tar preparations may be recommended at bedtime. The preparation is then removed by washing in the morning, thus eliminating the concern about odor during the day and limiting staining of daytime clothing. Tar preparations should not be used on acutely inflamed skin, since this may result in additional skin irritation.
Side effects associated with tars include folliculitis and, occasionally, photosensitivity.
Tar shampoos are often beneficial for scalp involvement.