You already know the causes and types of erysipelas from Book One. Erysipelas differs from phlegmon in that its redness is more obvious and bright, and with phlegmon the redness casts black or blue and most of the color of the blood of phlegmon is hidden in the depths. With erysipelas, the redness disappears from touch and the pressed area turns white due to the rarefaction of the matter of the erysipelas and its dispersion, but then the redness quickly returns, but with phlegmon this is not the case. In the redness of erysipelas you see a certain saffron and yellow tint, but in the redness of phlegmon you do not see this; with erysipelas, the tumor occurs only on the surface of the skin, and with phlegmon it also goes deep into the flesh; pure erysipelas is mobile, whereas phlegmon is not, and purulent erysipelas produces blisters, which is rare with phlegmon. Erysipelas does not resist pressure, but phlegmon does, and
the more the blood predominates over the bile, the more obvious the resistance and the stronger the beating and pain. Erysipelas entails a more severe fever than phlegmon, and the heat with erysipelas sometimes reaches the point that it burns the surface of the skin and a so-called coal is formed, but this does not happen with phlegmon. Inflammation during erysipelas is no less than inflammation during phlegmon, and even more, but tension and pain from tension during phlegmon are sometimes stronger, and therefore pain during erysipelas is less.
When erysipelas occurs, it most often occurs on the face and starts from the tip of the nose; then the tumor increases and spreads throughout the face; if erysipelas begins as a result of a bone fracture under the skin, this is bad. What is the difference between erysipelas and erysipelas you have already learned elsewhere.