I had excema as a kid, so I've definitely seen a dermatologist a couple times.
I've never had too many questions asked, usually they'll just look at the skin, sometimes with a magnifying glass or a light. Last time I was there I was a little concerned about this mole on my shoulder (thought it might be skin cancer or something- eep) and the doctor had barely walked through the door when he told me it was just a scar.
Anyway- don't stress! I've mostly found that they ask more questions regarding the skin itself (at least for me) as opposed to diet or anything like that. Just tell them what's been happening and they'll be able to help :)
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