Results: mean age was 27.9 ± 8.2; the proportion of abscess over 5 cm was 61.9%; the proportion of single lesions was 60.5%; 94.4% of patients had antibiotic treatment before hospital admission; 50.7% of patients underwent drain procedure; the proportion of bacterial growth was 63.6%; staphylococcus aureus accounted for 91.5%; abscess features related to treatment failure include: abscess size over 5 cm, diffuse lesions.