Erosive pustular dermatitis of the scalp  presents with pustules, erosions, and crusts on the scalp of primarily older Caucasian females, and on biopsy, has a lymphoplasmacytic infiltrate with or without foreign body giant cells and pilosebaceous atrophy. : 650 : 761

See also
Skin lesion
Cicatricial alopecia
List of cutaneous conditions


== References ==
Spine surgery is estimated to have the highest incidence of PION, 0.028%. Long duration of feet-above-head position in prostate surgery has also been suggested to increase risk of PION. Diagnosis
The diagnosis of PION is often difficult since the optic nerves initially appear normal. The injury occurs posterior to that portion of the nerve visible during ophthalmoscopic examination. There may be an abnormal relative pupillary response (APD) if the injury is confined to one optic nerve, but often it is bilateral and the symmetry of pupillary responses is maintained. Furthermore, MRI scanning may not be helpful. It is not uncommon for the erroneous diagnoses of malingering or cortical blindness to be made. If possible, an urgent neuro-ophthalmology consult is most likely to lead to the correct diagnosis.There is no confirmatory test for PION. PION is a diagnosis of exclusion. To prevent impending blindness, it is urgent to rule out giant cell arteritis when a patient over 50 presents with sudden vision loss. Differential diagnosis
In the postoperative setting, without gross eye injury, visual loss requires an assessment of the whole visual system for ischemic damage. The optic nerve is not the only tissue of the visual pathway susceptible to decreased blood flow. Decreased oxygenation of the retina or brain could also impair vision. Anterior ischemic optic neuropathy
PION is less common than Anterior Ischemic Optic Neuropathy (AION).