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Hi
  Our Son Niall who has DH along with a KIdney problem, is recovering
from flu at the moment, while he had a temperature his DH broke out
very badly on his arms, legs and back.
Although he has been sick and had temperatures several times over the
last ten months (due to his kidney problems) he had not had this rash for
the last eight months, so we were very disappointed to see its return.

Is it usual for DH to return when  one gets a temperature due to Flu.
I checked and rechecked his diet and the pills he was on and none of
them contained any gluten or dairy.

Thanks in advance for any advice.
Helen.