I’m not sure exactly what the right term was for what was wrong with my skin - I had huge solid deep spots, painful and full of awful gunk. Mainly across my cheeks / either side of my nose. They were genuinely awful. The photos I uploaded are really upsetting to look at now.
I used it for three months - the first month I got the same level of tret as your son as I hadn’t used it before them months two and three it went up to 0.05%
My skin improved a fair bit in the first month and then in the second it cleared up completely. I still get blocked pores on my chin but not obvious spots and I haven’t had a deep cystic type spot since.
I only use it about twice a week now and I still haven’t had a recurrence. I will be continuing with it, just need to upload some new photos and get my next tube.
My only real concern was the spots - I also have some patches of melasma on either side of my forehead but I didn’t really care about that. Those have significantly reduced too.
I think it’s a very fair price for how effective it is - I had spent a lot more on a shelf full of stuff that did bugger all.
They would probably agree to start your son on the higher dose of tret as he’s already on it.