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are apt to be small, numerous, and circular, with healthy skin intervening, while eczema of the scalp usually occurs in one large, diffused patch.

The symmetry of the eruption in psoriasis is also a characteristic feature. The eruption upon one extremity or one side

Fig. 15.—Nummular and circinate psoriasis.

of the trunk is usually duplicated upon the other side, while eczema is very frequently unilateral.

The papular syphilide often assumes a squamous form and presents for a time a strong resemblance to psoriasis. Fortunately it is rarely met with in childhood, but at any age it