A Pregnant Woman with Skin Lesions

A 30-year-old woman in her second trimester of pregnancy complained of multiple skin lesions that occurred in wheal patterns whenever she pressed firmly on her skin. Sometimes her skin would itch, causing her to apply pressure or rub and produce the wheal. Upon exam, the doctor could see a linear configuration on her arms from scratching and geometric configurations on her back, produced by her clothing
View the image taken (Figure 1) and consider what your diagnosis would be.