I would also talk to a specialist, and a
local herbalist as well, who can take a look at the problem in person and also take a good history from you. Skin stuff can be simple, or a symptom of something more complicated and related to any number of lifestyle choices or environmental factors.
But as an amateur herbalist with no formal training, I'd recommend
nettle leaf tea, used often as a seasonal allergy herbal go-to. It's a pretty safe herb, but it has a tendency towards lowering blood pressure, so watch out if you're already on BP medication. I might also try other "blood cleansing" herbs, like burdock
root or red clover flower. Also, drink lots of
water, and I second the good fats advice - I use the fermented cod liver oil from Green Pasture - it's pricy, but I think the quality is great.
Edited to add: Oh, and if you've got a friend with a
stinging nettle patch, by all means harvest some. Just wear gloves while handling it, until it's dried (or steamed, if you'd like to consume your nettles that way!).