Hi Robin,
I think a multidisciplinary team is the ideal. But a dermatologist who specialises is the best person to diagnose. You should be more likely to get a correct diagnosis. If it is not clear what it is, a biopsy should be done really, as treating LS involves long term steriod management and you don't want to be using that if it isnt LS.
You could always call your local hospital and ask if they have a vulval clinic also.
I would also consider using 0.01% estriol cream at some point, after any issues have been ruled out -start with a tiny pea size on the outside every other day and if all is well build up to a blob every day around/ on the vulva area to build up the skin. It will take 6 months to a year to see improvement, but it should look and feel much better on the outside.
Obviously get medical advice, but most of the issues down there are caused by lack of estrogen later in life.
Misdiagnosis is common, so make sure you clearly and strongly state that you have been before and I would take a friend or a partner with me as unfortunately it is statistically proven you get better service if you do!
PMX