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A mother brought her 4-week-old daughter to the doctor concerned about a vesicular rash that developed on the girl’s back within the last day. On examination, tiny vesicles in a primarily truncal distribution were seen. The patient had no systemic symptoms and appeared well.

View the image taken and consider what your diagnosis and next steps would be. Resolution of the case is described on the next page.

Figure 1.
A 4-Week-Old Girl with a New Rash on Her Back