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T-lymphocyte number and function as well as the effect of a thymic hormone on the T-suppressor cell subset were studied in 22 children suffering from psoriasis vulgaris, subdivided into two groups, those with less than 20% of total skin area involved and those with more than 20% of involvement. The T-cell number was lower in the latter group than it was in the first group or in normal controls. There was no significant difference in the functional activity of T cells in the two groups of patients. The number of T-suppressor cells was significantly lower in the psoriatic children than in normal controls, being lowest in the children showing greater skin involvement. THF, a thymic hormone isolated from calves, was found in vitro to induce T-suppressor cells in the peripheral blood of the psoriatic children, suggesting that this hormone may be able to play a role in the treatment of this disease.

We reported two cases of subcorneal pustular dermatosis (Sneddon-Wilkinson disease) which developed several hours after performance of an echography. To the best of our knowledge, there are as yet no reports in the literature relating performance of echography with the appearance of this rare disease. The possible explanation of the relation between the dermatologic disorder and the performance of echography is discussed.