This patient first developed a rash six days before this picture was taken. What is the diagnosis? Smallpox or chickenpox? After discussion: It is chickenpox. Note: (1) different stages of the rash are seen; (2) scabs are already present although it is only day 6 of rash; (3) smallpox vaccination scars are seen, thus making it less likely that the patient has smallpox.

spox_036