Infection-fighting white blood cells called T-cells are present in both psoriasis and eczema lesions, but the types of T-cells in the two are different, according to a study published in the New England Journal of Medicine. The researchers theorize that the two immune reactions are different and that the T-cells migrate to the skin in response to environmental triggers, not that the skin cells are abnormal. The finding may lead to targeted treatments for each disease, dermatologists said.

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