A 25-year-old patient works as a tractor driver. Four days ago, he got pain in the left axillary region, general weakness, fever up to 38°C. He hadn't sought medical helf until a painful solid lump appeared in this region. Objectively: in the left axilla there is a very painful cone-shaped mass sized 3x2,5 cm, with a destruction in the center of the pointed vertex. The surrounding skin is hyperemic, there are purulent discharges. What is the most likely diagnosis?