His writings state that raised blisters were present in the Antonine plague , usually in the form of a blistery rash .
According to Galen , it was black because of a remnant of blood putrefied in a fever blister that was pustular .
Galen 's writings state that raised blisters were present in the Antonine plague , usually in the form of a blistery rash .
According to Galen , it was black because of a remnant of blood putrefied in a fever blister that was pustular .