While I wish this thread was for me ... its not

One of my best friends is suffering through non stop heat rash. She is 20 weeks pregnant and can't seem to find anything to make this go away!
Any pregnancy safe suggestions?
Cross post - I also posted on the pregnancy board, just trying the Skin Problems board to cover all bases!
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Heather (27)
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Steve (29)
On a TTC Break after 3.5 years
Hubby has hyperthyroidism, with T4 at 85 (normal 22) and T3 at 35 (normal 6.5)
July 2009 - Radio Active Iodine - Failed. Did not kill off enough thyroid.
October 2009 - T4 is 29 and T3 is 22
Jan 2010 - Another round of RAI