From 1903 to 1907, he worked at the dermatological clinic in Bern, where he served as an assistant to Josef Jadassohn (1863–1936).
Afterwards, he returned to his hometown of Hamburg, where he worked in dermatologist Eduard Arning’s department at St. Georg's Hospital.
[1] Lewandowsky specialized in the study of tuberculosis and pediatric skin diseases, and published an important work in 1916 on tuberculosis of the skin titled Die Tuberkulose der Haut.
Just prior to his death, he described epidermodysplasia verruciformis, a rare skin disorder sometimes known as "Lewandowsky–Lutz dysplasia" (named along with dermatologist Wilhelm Lutz 1888–1958).
This article about a German person in the field of medicine is a stub.