Final answer:
Generalized acute pustular psoriasis, or Von Zumbusch psoriasis, is a severe type of psoriasis characterized by rapid development of pustules and thick inflamed skin patches, distinguished from chickenpox by the immune system abnormality causing skin cell turnover to accelerate.
Step-by-step explanation:
Generalized acute pustular psoriasis, also known as Von Zumbusch psoriasis, is a rare and severe form of psoriasis characterized by the rapid development of pustules on the skin. Unlike chickenpox, which is a common childhood disease with pustular lesions caused by the varicella-zoster virus, pustular psoriasis arises from an abnormality in the skin's immune system. Psoriasis involves a sped-up skin cell turnover process, with new cells moving to the surface in only a few days instead of a month, leading to thick inflamed patches.
The condition can cause painful lesions primarily on the face or trunk and may last several weeks. If severe, it may lead to complications such as postherpetic neuralgia or organ involvement. Von Zumbusch psoriasis should not be confused with other skin conditions such as impetigo, which results in similar pustules but stems from a bacterial infection.