Salicylic acid/ urea/ white petrolatum ointment is a keratolytic and debriding combination that works by breaking down dead skin and softening the skin. It is worth noting that certain acne products that contain Salicylic acid can rarely cause serious and sometimes life-threatening allergic reactions or severe irritation. However, before first use, you may need to follow certain steps to make sure you do not have an allergic reaction. First off, you need to use Salicylic acid/ urea/ white petrolatum ointment as you were told by your doctor or read the package label to make sure that you follow the instructions correctly. Don’t hesitate to discuss any questions or concerns with your doctor.