To reinforce the idea

Yeasts are not the main cause of SD and of course is wrong to think like that. Yeasts are consequence, like the body terrain changes in a way that let population survive in some pattern places because something is missing there (defenses?) probably

Let's look at this SD suffering examples:
http://images.google.pt/images?hl=pt-PT&tbs=isch:1&q=seborrheic+dermatitis&sa...


Then let's take a look at this:
http://images.google.pt/images?hl=pt-PT&tbs=isch:1&q=vitiligo+pattern&sa=N&st...


Fortunately SD is not so heavy and social compromising issue, but we can identify some patterns very closely related between SD and Vitiligo, not mentioning that vitiligo is much worst.

But, at the pictures we see one of the most famous Vitiligo victim and taking a look at his past we can verify that he had EMOTIONAL issues in his infant life.

I'm SD sufferer and I have UNRESOLVED issues of EMOTIONAL problems that remains subconsciously written in my brain. And that started when I was young...

So.. Probably; (We cannot say that emotional is the cause for all Seborrheic people). But that emotional is one cause I'm almost sure and again the PATTERN is there always, Hemispheres, left and right. For the Vitiligo seems that body defenses attacks Melanin production ( seems that..., because no one knows) and SD in my opinion seems contrary, body defenses simply relax and let parasites survive in the patterned places...

And the link is there: SD takes place on people with neurological diseases like Parkinson's.

A quote from some studies:
3) The Seborrheic Dermatitis often associated with Parkinson's disease is a defense reaction by which the body limits the availability of myristic acid, a critical component of the retroviral virion.

Facts explained:

a) A critical step in the release of retroviral virions from an infected cell is the attachment of a myristic acid moiety to the amino end of the Gag precursor protein. (4)

b) Myristic acid is a 14-carbon saturated fatty acid. Mammalian lipases construct fatty acids with at least 16 carbons. We get myristic acid in our diet and from comensal microbes including lipophilic Malassezia yeasts that inhabit the sebaceous regions of the skin.(1)

c) Malassezia yeasts have been associated with Seborrheic Dermatitis , but in some indirect way. Treatment with antifungal agents is effective and the dermatitis returns when the yeast population builds back up. (10,9,5,6) But no consistent differences in yeast population have been shown between patients with and without Seborrheic Dermatitis , and one study comparing normal healthy subjects, patients with seborrheic dermatitis, and patients with other inflammatory syndromes, showed no significant difference in immune response to specific M. furfur proteins. The authors suggest the dermatitis is caused by a low molecular weight lipophilic product of the yeast.(9)

d) Patients with seborrheic dermatitis have an increased irritant reaction to sodium lauryl sulfate, which can act as a substrate for microbial lipases.(5)

e) Patients with HIV, a known retrovirus, tend to have severe seborrheic dermatitis. (5,9,8)

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Now answering your question:
The only technology that is dealing with emotional issues is EFT (www.emofree.com)