Final answer:
Wet Wrap Therapy is the step that may occlude the TCA, increase penetration, and reduce excoriation.
Step-by-step explanation:
The step that may occlude the TCA (Topical Corticosteroid Application), increase penetration, and reduce excoriation is Wet Wrap Therapy.
Wet wrap therapy involves applying a layer of moisturizer or topical medication to the affected skin and then wrapping it with a damp bandage or clothing. This helps to lock in moisture, enhance the absorption of the medication, and protect the skin from scratching and further damage.
Other options like phototherapy, bleach baths, and evening primrose oil may have their own benefits for certain skin conditions, but they may not specifically address occlusion, penetration, and excoriation like wet wrap therapy does.