My husband has a bright red knot about the size of a golf ball in his lower leg around his calf area, it started out as a sore, from wear of new work boots, the boots rubbed a sore on his leg, it is white on top of the scab, with pain shooting all the way up to his private area, he can barerly walk on it, when I touch the surrounding area of the sore, it is warm, it has heat coming off of the area, he is experiencing chills, possibly fever from it, I told him that it was infection possibly staff and that he needed to go to a doctor, what is your advice on this medical condition,