Thank you for your query.
I can understand your concern. However, the description does not suggest any allergy
to food. You need to note the following to come to a conclusion:
1. What time of the year does it appear?
2. How does it get relieved?
3. Any relationship with use of any cosmetic or any new thing in her environment?
4. What is the effect after applying any oil/vaseline over the area?
Most probably it could be just dryness of the skin due to the weather and application of oil/vaseline should make the rash
I hope I have answered your query to your satisfaction.
Wishing your daughter all the best.