allergic phytodermatitis

Question 1

lesion

Answer 1

Characterized by an acute, very pruritic, eczematous dermatitis, o ten in a linear arrangement

Question 2

most common plant

Answer 2

In the United States, poison ivy/oak are by ar the most common plants implicated

Question 3

most common etio

Answer 3

ETIOLOGY Pentadecylcatechols, present in theAnacardiaceaeplant amily,arethemost common sensitizers in the United States. T ey cross-react with other phenolic compounds

Question 4

ahat plant family

Answer 4

PLANTS Anacardiaceae Family. Poison ivy (Toxicodendron radicans), poison oak (T. quer- ci olium, T. diversilobum), and poison sumac (T. vernix). Plants related to poison ivy group: Brazilian pepper, cashew nut tree, ginkgo tree, Indian marker nut tree, lacquer tree, mango tree, and rengas tree.

Question 5

after 1st exposure… dermatitis happends after how many days

Answer 5

Af er rst exposure (sensitization), dermatitis occurs 7 to 12 days later

In a previ- ously sensitized person (maybe many decades be ore), dermatitis occurs in < 12 h af er re- exposure

Question 6

lesion

dist

Answer 6

Initially,well-demarcatedpatches o erythema,characteristiclinearlesions
(Fig. 2-8); → papules and edematous plaques; maybesevereespeciallyonthe aceand/or genitals, resembling cellulitis (Fig. 2-9) → microvesiculation → vesicles and/or bullae (Figs. 2-8 and 2-10) → erosions, crusts. Postin-
ammatory hyperpigmentation common in darker skinned individuals.
Distribution. Most commonly on exposed extremities, where contact with the plant occurs

Question 7

tx

Answer 7

theetiologicagent.
TOPICALTHERAPY opical glucocorticoid ointments/gels (classes I–III). Larger vesicles may be drained, but tops should not be removed.Wetdressingswithclothssoaked
in Burow’s solution changed every 2 to 3 h. Airborne ACD may require systemic treatment.
Pimecrolimusandtacrolimusaree ectivein ACD but to a lesser degree than glucocorticoids. SYSTEMICTHERAPY Glucocorticoids are indi- catedi severeandinairborneACD.Pred- nisone beginning at 70 mg (adults), tapering by 5 to 10 mg/d over a 1- to 2-week period.
In airborne ACD where complete avoidance
o allergenmaybeimpossible,immunosup- pression with oral cyclosporine may become necessary.