DERMATOLOGY

INSECTS

AND

PARASITES

PEDICULOSIS (LICE)

Nits firmly attached to hair shafts.

Under a microscope, an egg with a developing head louse, attached to a hair shaft.

PEDICULOSIS (LICE)

Pubic louse

Egg and louse ona hair shaft.

LICE TREATMENT

1. KILL THE LICE2. COMB OUT THE

NITS3. CLEAN THE HOUSE

SCABIES

SCABIES

Papules and tan or skin-colored burrows in typical location on the

finger web.

Under microscope, a mite at the end of a burrow with eight eggs

and smaller fecal particles obtained from a papule on the

web space of the hand

HYMENOPTERA

WaspBee Yellow jacket Hornet

Angioedema

FLEAS •Multiple, pruritic, urticaria-like papules at sites of flea bites on knees and legs of a child•Usually 1 cm in diameter and may have a vesicle on the top. •When scratched, they exhibit erosions or crusts

BED BUGS

•Pruritic, urticaria-like papules at sites of bedbug bites on the lower back at the waist. •In previously unexposed individuals, bite sites appear as erythematous, pruritic macules. In sensitized individuals, intensely pruritic papules, urticaria, or vesicles/bullae may arise.

MOSQUITO

BLACK WIDOW SPIDER

BROWN RECLUSE SPIDER

TICKS

CASE STUDY 1

A mother brings in her 7-year-old daughter because she caught

something at school. All day she has been itching her head, and it

looks like she has dandruff flakes in her hair. She tried washing her hair at home, but the problem persists.

CASE STUDY 1

You see the following in her hair.

Treatment: Permethrin

preparations(Nix, Rid)

Decontaminate the home

Wash all clothes, sheets, etc

Hot cycle on dryer for 20 minutes

Vacuum daily Check head for nits &

new hatches daily

Etiology:Pediculosis

CASE STUDY 2

30-year-old male presents to the ER shortly after having gone to bed, unable to sleep because of severe itching. He has a papular rash at the interdigital

web spaces, volar wrists and antecubital fossa. He just started working in a

nursing home last week, and recalls that is when the rash began.

CASE STUDY 2

Etiology:

Diagnosis:

Treatment:

Sarcoptes scabiei

Mineral oil, microscope slidePermethrin, LindaneClothing, bedding, and towels should be

washed with hot water or dry cleaned to prevent reinfection

CASE STUDY 3

A 20-year-old female was gardening, and was stung by a bee. About 5

minutes later she felt light-headed and had dyspnea and felt warm. She

called an Ambulance, who administered oxygen on the way to the ER. Her BP is now 80/46 and her

pulse is 124.

CASE STUDY 3

What happened?

Treatment:

Her 6-year-old son was also in the garden, and was stung as well, but c/o

only local pain.

Treatment:

Anaphylaxis

Epinephrine, pressors, oxygen

Benadryl, topical steroid

CASE STUDY 4

A 24-year-old female just returned from a camping vacation in

Maryland, and complains of flu-like symptoms. She is thankful they

didn’t happen earlier because she went hiking, swimming and rock

climbing on the trip.

CASE STUDY 4

Physical exam is normal except

for the following rash on her back.

What is this rash?

What is the disease and

etiology?

Erythema migrans

Lyme’s disease

Borrelia burgdorferi