This patient first developed a rash 10 days before this picture was taken. What is the diagnosis? Smallpox or chickenpox? After discussion, it is smallpox.
Note: (1) the pocks are at a similar stage of development in each area (2) the distribution of the rash is characteristic for smallpox, with more pocks on the face and extremities than on the body (3) although it is day 10 of rash, only a few scabs have formed.

spox_032