These are the signs of the imposthumes that are formed from sanguine humour, redness386 and swelling round them, fulness of the veins, throbbing, flaccidity, and leaping. Averroes says the signs are red colour along with extreme heat, and great pain. These are the signs of the imposthumes that are formed from choler, the member becoming yellow, violent pain, and thinness of the humours; and of this kind is the imposthume called formica deambulativa. Symptoms of the imposthume formed from phlegm: the member white, without great pain even on pressure, and it is soft: and swollen with a broad base. Symptoms of the imposthume formed from melancholy; no great pain, colour black, dark and swarthy, earthy (?) and the veins round it are full of melancholic humour.