Hi my dad has a bump on his ankle that is about a half inch raised above the skin. About an inch all around the outer part of the raises bump is red. The doctor did a culture and also took out some cottage cheese looking stuff. He didn t take it all out just enough to relieve some pressure. He has been on 3 different antibiotics and it has never went downs it just keeps getting larger. It is somewhat scabby and the scab is black with some white coloring. He said he feels pain going up his calf muscle . They are scheduling for a biopsy because the doctors don t know what it is. It s a large bump on the side of his ankle and it s very hard to the touch. Can you please give is some help on what it might be?