SOUTHERN ILLINOIS UNIVERSITY / SCIENCE PHOTO LIBRARY SOUTHERN ILLINOIS UNIVERSITY / SCIENCE PHOTO LIBRARY
Secondary syphilis on palm of hand. Syphilis is a sexually transmitted disease (STD) caused by the bacterium Treponema pallidum. It has often been called "the great imitator" because so many of the signs and symptoms are indistinguishable from those of other diseases.
Model release not required. Property release not required.