apulo-squamous syphiloderm from
psoriasis?#

In psoriasis the eruption is more inflammatory, and usually bright red;
the scales whitish or pearl-colored and, as a rule, abundant. It is
generally seen in greater profusion upon certain parts, as, for
instance, the extensor surfaces, especially of the elbows and knees. It
is not infrequently itchy, and, moreover, presents a different history.

In the syphilitic eruption some of the papules almost invariably remain
perfectly free from any tendency to scale formation; there is distinct
deposit or infiltration, and the lesions are of a dark, sluggish red or
ham tint; and, moreover, concomitant symptoms of syphilis are usually
present.

#Describe the annular eruption of syphilis.#

The _annular syphiloderm_ (_circinate syphiloderm_) is observed usually
in association with the large-papular eruption, and consists of several
or more variously sized, ring-like lesions, with a distinctly elevated
solid ridge or wall peripherally and a more or less flattened centre. It
is commonly seen about the mouth, forehead and neck. The lesion appears
to have its origin from an ordinary, usually scaleless or slightly
scaly, large papule, the central portion of which has been incompletely
formed or has become sunken and flattened. The manifestation is rare,
and is seen most frequently in the negro.

#What several varieties of the pustular syphiloderm are met with?#

The small acuminated-pustular syphiloderm, the large acuminated-pustular
syphiloderm, the small flat-pustular syphiloderm, and the large
flat-pustular syphiloderm.

#Describe the small acuminated-pustular eruption of syphilis.#

The _small acuminated-pustular syphiloderm_ (_miliary pustular
syphiloderm_) is an early or late secondary eruption, commonly
encountered in the first six or eight months of the disease. It
consists of a more or less generalized, disseminated or grouped,
millet-seed-sized, acuminated pustules, usually seated upon dull-red,
papular elevations. The eruption is, as a rule, profuse, and usually
involves the hair-follicles. The pustules dry to crusts, which fall off
and are often followed by a slight, fringe-like exfoliation around the
base, constituting a grayish ring or collar. Minute pin-point atrophic
depressions or stains are left, which gradually become less distinct.
Scattered large pustules, and sometimes papules, are not infrequently
present.

#Describe the large acuminated-pustular er