These treatments can have harmful side effects, and over the subsequent weeks and months the dosage is gradually reduced until the lowest efficacious dose is attained which will control the condition. A low dosage of the drug treatment is administered for several months or years in order to maintain the condition. It is important to be aware of the risk of infection to the skin, especially when blisters are broken. An antibacterial ointment is routinely applied to the skin for this purpose. Some people find bathing with a non-scented oil very soothing, whilst others have reported an intolerance to any bathing.
Some people report adverse reactions to strong sunlight.