Dermatosis neglecta

Age: 20 years
Gender: Female
Site: Back
Duration: 2 months
History:
* History of operative fixation of thoracic and lumbar vertebrae.
* Hyperesthesia over the site of operation.
* Lack of cleaning of the involved area.
* Asymptomatic, dirt-like plaques on both sides of the operation.
Findings:
* Midline scar of previous operation.
* Brown-black dirt-like plaques on both sides of the scar.
* Eradication of the rash on vigorous rubbing with 70% isopropyl alcohol (the right side of the rash evident in the second photo).
Diagnosis:
Primarily clinical and can be confirmed by disappearance of the rash through vigorous rubbing with 70% isopropyl alcohol.
Treatment:
Rubbing the rash with 70% isopropyl alcohol or vigorous cleaning with soap and water can abolish the rash , this can be considered as both diagnostic and therapeutic test!

N.B: The only difference between dermatosis neglecta and terra firma-forme dermatosis is that there is no history of lack of hygiene or cleaning in the latter!