10mo DS developed this rash a few weeks ago. At the time the GP agreed that is was a viral rash (he was sick at the time, tests only showed rhinovirus). The rash has become worse in the last couple of days though and despite his ongoing cough, which is pretty normal for him after a cold, he's now otherwise well.

He does tend to get a bit rashy in dry weather but this is the worst I've seen. Do you think it's just dry skin or does it look like something else?
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It's mostly on his back.