hi..thanks for your query
Your presentation points towards the diagnosis made by your dermatologist
.Peri oral dermatitis
does not have any relation to your food habits .I think you should also stop the use of all topical medications and cosmetics.Only vaseline should be used.Unfortunately, any natural remedy does not solve this problem.
You should only use non soapy facial cleanser and prevent the area from drying by using medicated emollients.
Hope this is helpful.take care.