A patient comes with the H/O swelling in the submandibular region. He is diagnosed to have submandibular abscess. The incision to drain the abscess is put 1 cm below the base of the mandible because
The submandibular gland appears 1 cm below the mandible
It is difficult to incise along the margin of the mandible
The marginal mandibular nerve may be injured if incision is along the base of mandible
To avoid injury to the cervical branch of facial nerve