To see if evening primrose oil (EPO) could be more effective in a certain type of atopic dermatitis, we administered EPO to 14 atopic dermatitis patients characterized by itchy dry scaly skin. Furthermore, we measured serum levels of γ-interferon (IFN-γ) and IgE in addition to the clinical severity before and after the treatment to find out whether the treatment effect of EPO is related with an immunological mechanism. After the treatment, the extent of the skin lesions and the pruritus were markedly reduced in all patients. While serum IFN-γ levels were significantly increased (p < 0.01) after the treatment up to those of the normal control group, serum IgE levels showed a significant decrease (p < 0.05), failing to normalize completely. We concluded that EPO could be highly effective in the treatment of a grossly noninflammatory type of atopic dermatitis. The restoration of serum IFN-γ levels indicates that EPO might exert its effect through the modulation of the immunological mechanism involving IFN-γ.

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