A friend directed me to this app because I've got a skin problem in my third trimester (35 wks)

I 've got a red, itchy rash on the inside of the skin fold between my leg and labia the test results are coming back as nothing every time and the midwives don't seem concerned because it doesn't directly affect childbirth, so it's not viral but it is driving me crazy causing me to lose sleep and feeling very upset and self conscious as nothing is working.

I've Googled, WebMDd and baby forumed every symptom answer still I haven't resolved it

The only other thing I can think of is its a hormonal change causing the problem has anyone else had a similar problem or knows what this could be?