Dermatologic manifestations of giardiasis.

We have presented a case of atopic dermatitis associated with Giardia lamblia infection, which has not been previously described. Review of the world literature shows an association between giardiasis and urticaria. Other allergic phenomena, such as angioedema and possibly arthropathy, also might be associated with this infection. When confronted with these clinical problems, giardiasis should be included in the differential diagnosis. As these complications respond to specific therapy, identification of this organism as its cause can be particularly rewarding.