This recommendation for an allergist & immunologist comes from the American embassy. The American embassy maintains a list of health professionals within the Federal District, and this is updated on a regular basis. 

Francisco Leite & Dal Margo Dermatologia is a dermatological clinic. They are located in the Edifício Brasília Medical Center, SGAN 607 – Asa Norte. 

The dermatologist recommended is Dra. Ana Cristina Bezerra and she speaks Portuguese and English.