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Skin is the first line of defense and encounters a variety of microbes. Some pathogenic strains are often the cause of a broad range of infections of the skin and other body systems. These conditions can affect people of all ages and may have different causes, including genetic factors, infections, autoimmune reactions, environmental factors, and lifestyle choices.
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Inflammatory Bowel Disease II: Crohn's Disease01:30

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Healing II: Complications01:24

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Complications during healing arise when tissue repair is altered by local or systemic factors. These changes involve abnormal collagen deposition, altered biomechanics, and reduced vascular supply, impairing restoration of normal structure and function.Loss of FunctionScar tissue differs significantly from the original tissue it replaces. In the skin, fibrosis lacks adnexal structures such as hair follicles, sebaceous glands, and sweat glands. Their absence reduces tactile sensitivity, impairs...
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Intestinal obstruction triggers a series of physiological responses, starting with gas and fluid accumulation in the bowel segment proximal to the obstruction, leading to distension. This distended intestine compresses the diaphragm, hindering lung expansion and potentially leading to reduced respiratory effort, atelectasis, and pneumonia.To overcome the blockage, the gut intensifies contractions, causing colicky abdominal pain, nausea, and vomiting, which reduces fluid and food intake and...
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Updated: May 5, 2026

Murine Ileocolic Bowel Resection with Primary Anastomosis
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Cutaneous lesions after intestinal bypass

E J Drenick, A R Ahmed, F Greenway

    Annals of Internal Medicine
    |October 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Bypass enteropathy can cause skin lesions resembling lupus, linked to immune complexes from bacterial overgrowth. Treatment and reversal of the bypass resolved these symptoms and skin findings.

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    Area of Science:

    • Gastroenterology
    • Dermatology
    • Immunology

    Background:

    • Intestinal bypass surgery can lead to complications like bypass enteropathy.
    • Skin manifestations are occasionally reported in patients with bypass enteropathy.

    Purpose of the Study:

    • To investigate the nature and potential mechanisms of skin lesions in patients with bypass enteropathy.

    Main Methods:

    • Clinical observation of skin lesions in intestinal bypass patients.
    • Histologic examination of skin biopsies.
    • Immunofluorescent microscopy to detect immune deposits.

    Main Results:

    • Papulopustular or nodular skin lesions were observed in 23 of 81 patients.
    • Histology revealed vasculitis in several cases.
    • Immunofluorescence showed immunoglobulin and complement deposits, mimicking a lupus band test.
    • Skin lesions resolved with metronidazole or bypass reversal.

    Conclusions:

    • Skin lesions in bypass enteropathy may be an immune-complex mediated phenomenon.
    • Bacterial overgrowth in "blind loops" is a potential trigger.
    • Reversal of intestinal bypass surgery offers a permanent resolution.