n said to be discrete?#

When the lesions constituting the eruption are isolated, having more or
less intervening normal skin.

#When is an eruption confluent?#

When the lesions constituting the eruption are so closely crowded that a
solid sheet results.

#When is an eruption uniform?#

When the lesions constituting the eruption are all of one type or
character.

#When is an eruption multiform?#

When the lesions constituting the eruption are of two or more types or
characters.

#When are lesions said to be aggregated?#

When they tend to form groups or closely-crowded patches.

#When are lesions disseminated?#

When they are irregularly scattered, with no tendency to form groups or
patches.

#When is a patch of eruption said to be circinate?#

When it presents a rounded form, and usually tending to clear in the
centre; as, for example, a patch of ringworm.

#When is a patch of eruption said to be annular?#

When it is ring-shaped, the central portion being clear; as, for
example, in erythema annulare.

#What meaning is conveyed by the term "iris"?#

The patch of eruption is made up of several concentric rings. Difference
of duration of the individual rings, usually slight, tends to give the
patch variegated coloration; as, for example, in erythema iris and
herpes iris.

#What meaning is conveyed by the term "marginate"?#

The sheet of eruption is sharply defined against the healthy skin; as,
for example, in erythema marginatum, eczema marginatum.

#What meaning is conveyed by the qualifying term "circumscribed"?#

The term is applied to small, usually more or less rounded, patches,
when sharply defined; as, for example, the typical patches of psoriasis.

#When is the qualifying term "gyrate" employed?#

When the patches arrange themselves in an irregular winding or
festoon-like manner; as, for instance, in some cases of psoriasis. It
results, usually, from the coalescence of several rings, the eruption
disappearing at the points of contact.

#When is an eruption said to be serpiginous?#

When the eruption spreads at the border, clearing up at the older part;
as, for instance, in the serpiginous syphiloderm.

#RELATIVE FREQUENCY.#

#Name the more common cutaneous diseases and state approximately their
frequency.#

Eczema, 30.4%; syphilis cutanea, 11.2%; acne, 7.3%; pediculosis, 4%;
psoriasis, 3.3%; ringworm, 3.2%; dermatitis, 2.