Repeated infections of follicles underneath the eyelid cause scar tissue to build up.

Inflammation, edema, epithelial sloughing are common features, which left untreated can cause scar formation and pulmonary and airway remodeling.

This may cause scar tissue (cell proliferation) to rapidly grow over the stent.

The pressure vacuum can cause scars, asymmetry and paralysis.

In 1978 a carbon dioxide was also used, but generally caused scarring after treatments.