oil.

A thymol or carbolized boric-acid lotion will relieve the irritation.

#Leptus.#
(_Synonym:_ Harvest-mite.)

#State the characters of the lesion produced by the leptus.#

This minute brick-red mite buries itself in the skin, especially about
the ankles and feet, giving rise to papules, vesicles and pustules.

Treatment consists of the use of a mild sulphur ointment or of a
carbolic-acid lotion.

#[OE]strus.#
(_Synonym:_ Gad, or Bot-fly.)

#Describe the cutaneous disturbance produced by the [oe]strus.#

The ova are deposited in the skin, develop and give rise to the
formation of furuncle-like tumors with central aperture, through which a
sanious discharge exudes; or as the result of the burrowing of the
larvae, irregular serpiginous lines or wheals are produced.

It is chiefly met with in Central and South America.

_Larva migrant_, or _creeping disease_, is doubtless in this same class.
It is characterized by a thread-like linear formation of an
erythematous, erythemato-papular, or vesicular nature that gradually
extends, the older part disappearing; considerable surface may be
covered before the parasite disappears or dies. The treatment consists
in endeavoring to destroy the organism by means of excision or caustic
applications at the point of its suspected site which is just ahead of
the extending line.

#Pulex Penetrans.#
(_Synonyms:_ Sand Flea; Jigger.)

#Describe the cutaneous disturbance produced by the pulex penetrans.#

This microscopic animal penetrates the skin, especially about the toes,
producing an inflammatory swelling, vesicle or pustule, or even
ulceration. It is met with in warm and tropical countries.

Treatment consists in extraction. Essential oils are used as a
preventive. A carbolic-acid or alkaline lotion relieves irritation.

#Cimex Lectularius.#
(_Synonym:_ Bed-bug.)

#Describe the characters of a bed-bug bite.#

An inflammatory papule or wheal-like lesion results, somewhat
hemorrhagic; the purpuric or hemorrhagic point or spot remains after the
swelling subsides, but finally, in the course of several days or a few
weeks, disappears.

Treatment consists in the application of alkaline or acid lotions.