Hi Delizco :)
I was put on 'Roaccutane' (same thing i expect, maybe UK brand) at 16, after a few years with very bad skin from a young age - i have little doubt now this was due to the terrible diet in our house; mainly carbs (sugar) + stress ;) And i would advise that any of these will throw your body our of balance and you will produce excess sebum. Apparently certain genetics - white western and indigenous American - are very susceptible to carbs and their effects (according to Nora Gedgaudas from PBPM).
Roaccutane also did wonders for me, though i had a few experiences shedding skin like a snake and extremely dry eyes! I was probably only on it for a year if that. If i knew now what i did then........! I also had a flatmate who went on it after years of problems at 26. she lived on carbs....
From there i had relatively reliable skin, prone to breakouts, but nothing - nothing - like before. Because of my experiences. and myself generally, i was always paying close attention to skin care and experimenting with different products. So i have been experimenting with essential oils for treatment and oils in general and, i believe, this is the most optimal for regulating sebum production.
Key is: Cleanse and moisturize. Without the added moisture, to my knowledge and from experience, your skin will detect this and produce as much sebum to protect the skin as it can.
initially, and i have read elsewhere, you need to do a few 'rounds' with cleansing your skin, and deeply moisturising it. Apparently acne prone skin is one of the most sensitive and most slow to regenerate (even though all that oil feels like it's busy), so you need to have a few months of telling it that you're sorting it out. See below for my suggestions.
The odd spot:
Tea tree oil directly to the area, with a Q-tip.
Weekly exfoliation:
i have found bicarbonate of soda, mixed into a paste - can all be 'made' in palm of hand as needed - gently massaged all over the face to neutralise the dirt and as an exfoliating treatment (to slough off the dead skin cells) - you can add a (one) drop of tea tree, or lavender - lavender soothes inflammation and aids healing and cleanses. I believe Dermatoligica does a 'skin powder' (which is where i got the idea! ;) )but i'm not sure of it's formulation, and why waste the money?? If you are gentle, the bicarb shouldn't give you any problems. You can add a pea sized amount to a sink of warm water (maybe 1 drop Tea tree onto the powder so dissipates onto the surface of the water) and use that as a very gentle cleanse for every day.
Moisturiser: For me, this was the trickiest! No matter what, after application of any store bought version i would shine like a star... Now i use olive oil (good quality in UV proof bottle, the stuff i put on my salad!)l on my skin and it works better than anything i have ever tried. However i am now older (30), i follow the diet and i have given my skin time to balance. For younger skin, I would advise hemp oil may be the best. It is light, absorbs easily, contains many good fats and things to tell your skin that it has a protective barrier - thanks! - so it doesn't need to go haywire and produce it by the bucket load.
If you just put a few drops onto lightly wet hands, rub together, and massage in. The key here is to have a mixture of oil and water on your palms, mix briefly by rubbing, and apply. The water makes it go further and is very important so that when it dries, it isn't like a blob of oil drying. It should almost emulsify on your skin, and melt in. You should find after a few minutes, less if your warm, it will have absorbed and you skin feels as though you just left the shower. In theory this should also provide some 'barrier' and it will also tell your skin, by being absorbed, to calm down. I think the process is similar to how people use 'baby oil' (petroleum) but for some reason when explaining people misunderstand and find it 'very strange' to be putting 'oil' on their face. Well, tell that to the Romans!
The other tip is: initially, you need to thoroughly cleanse, but then thoroughly moisturize AND massage the face with the oil - including and especially the 'problem' areas. As this process is bringing blood to the surface (to take away the toxins) and massaging the oils in, tells those cells to slow down production. It took me some time to adjust to the idea of rubbing oil on my nose (blackheads :( ) but when i do this regularly i can visibly see they are lessened. It does go against the idea of 'ripping them out'( or 'drying them with harsh alcohols) but when has conventional wisdom ever been right? ;P
Once you have the hang of your moisturizer, i personally like to finish it off by dropping either Tea tree (if i feel i need to 'refresh' my skin) or lavender (if i've been out in the sun for example) onto my still damp palms and massage into my still damp face. Tea tree oil can smell sterile but lavender is natures own (non toxic) fragrance ;)
i have experimented with many other oils but found i only need: Bi carb, Hemp/Olive oil (almond in winter) plus tea tree and lavender. I use coconut oil in my hair but have read it is the most comodegenic (blocks pores) of all, so i would advise against that. I accept many 'organic' companies have great natural formulations but as with many problems, simple - with least chance for reaction - is best.
hope this helps somewhat and good luck with the diet