In the study, tumors with size > 25 mm had a risk of increasing hematoma size > 15 mm 3.2 times higher than those < 25 mm, rich vascular FA on Doppler mode had a risk of increasing hematoma size > 15 mm, 5.8 times higher than non-vascular FA, the distance from the skin to FA ≤ 2 mm had 3.4 times more risk of bruising than those with that distance > 2 mm, these differences are statistically significant with p < 0.05.