Typical symptoms of furuncular myiasis include itching, a sensation of movement, and sometimes sharp, stabbing pain. At first, people have a small red bump that may resemble a common insect bite or the beginning of a pimple (furuncle). Later, the bump enlarges, and a small opening may be visible at the center.
Preseptal cellulitis. 1  Acute onset of swelling, redness, warmth and tenderness of the eyelid. 2  Eyelid oedema in the absence of orbital signs such as gaze restriction and proptosis. 3  Fever, malaise, irritability in children.  Ptosis.
Infection Investigation. Preseptal cellulitis refers to the infectious involvement of the eyelid and periorbital soft tissue anterior to the orbital septum. Conversely, orbital cellulitis is the infectious involvement of tissue posterior to the orbital septum, including the fat and muscle within the bony orbit. The distinction is important because a delay in diagnosing orbital cellulitis may be associated with visual and life-threatening sequelae.