syphilis. human lips with chancre. treponema pallidum

bacillus bacteria bacterium bejel biological biology blister blisters canker care cause chancre close closeup cold dermatology diagram disease diseases epidemic face fever firm health healthcare herpes human ill illness illustration infection infectious injury labialis lip lips macro medical medicine micro microbe microbiology microorganisms microscope microscopic mouth painless pale pallidum pathology pinta research science scientific sex sexually sick sickness simplex skin sore sores spirochaete surface swollen syphilis transmitted treatment treponema treponemal ulcer use vector veneral virus woman yaws