My wife has a rash that began on her inner thighs, seems to be spreading in patches, it is now under her arms and spreading up onto her neck.Dermatologist says hives, use benedryl, etc. Used  meds with no change.GP has no idea but believes it caused from internally.  Is placing photo for help on doctors page for help in ID ing it.Doesnt itch, doesnt look like pimpleshas not changed diet or eaten different foods.  No new meds.I have reviewed pics on web sites and unable to find a similar rash
Hi, thanks for posting your query. You have mentioned that your wife has developed rashes in the fold areas like thighs, under arms, neck. It is not associated with itching probably because if she uses been Chat Doctor. It can be probably fungal infection. Other differential diagnosis can be intertwine, contact dermatitis, inverse psoriasis, or even scabies. Of course posting of photos might help in identifying it. Upload the photos if possible. You may contact a dermatologist for exact diagnosis and appropriate treatment. A skin biopsy may help if it can not be clinically identified. Hope this helps you.