Ladypepper & Hating glasses
Sertiun like me comes from the UK, where our health service works differently (I'm not saying better or worse - depends what you need - just differently). Your primary physician (we call them a GP) is pretty much allocated to you, and it's difficult to shop around for new ones unless you have a good reason (usually relocating) to leave one practice and join another.
These physicians act as gatekeepers to more specialised consultant doctors and services. They assess whether you need to see them, and refer you if they think you do. Unless you can afford private healthcare (only the very well off, or people in the [I]very[/I] rare companies that offer healthcare insurance as part of an employment package, usually only 'high-flyers'), you cannot book or insist to see a dermatologist or any other healthcare specialist direct. You can only request/suggest it, and your GP will agree or otherwise depending on whether he/she judges it necessary and thinks it a good use of resources.
The idea of seeing a dermatologist - or any other specialist doctor - for annual check ups just doesn't happen here, unless you have a condition like diabetes, or have already had a disease like cancer, or a coronary and are being monitored for recurrence. Basically, you otherwise see a doctor only when you are ill, or when your GP organises a screening programme for this or that, which is run by him, nurses, or support staff, not specialist physicians. There are a few exceptions to this mode of practice, but not many.
This system gives General Practitioners a lot of power. Often they are good professional people and are not slow to refer you on, though that's not even half the battle. I was referred for investigations for gallstones in November last year (GP was 99% sure I had them, and boy was I in pain), and the appointment just to have a scan only came through 3 weeks ago, never mind to even see the hospital consultant. In the meantime I'd been admitted and had my gallbladder removed as an emergency in January , but no-one had bothered to take me off the waiting list
If it hadn't got badly infected, I'd still be waiting just to see the specialist). Sometimes though you have to negotiate hard with your GP to get the attention you need.
Being under 18 can also mean Toodles might find it hard to be taken seriously by his doctor, and he would need a parent to back him up, and make it clear they support his wishes, though for many medical problems young people his age would probably prefer not to have their parents involved in personal aspects of their healthcare. I take it though that Toodles has his parents onside in all this.
It's excellent you do have an appointment with a dematologist, Toodles. Best of luck with it. Keep us posted. I know it's tempting, but Ladypepper is absolutely right - I would wait to hear what the dermatologist has to say before pressing on with the urine remedy, just in case you end up masking (not curing) symptoms he needs to know about to diagnose what is going on with these moles. If they are respondoing that quickly to the urine, they certainly don't sound typical or maybe normal moles to me.