# Endogenous Hypersensitivity Infection: A Unifying Framework for Cutibacterium acnes-Associated Sarcoidosis

## TL;DR

This paper proposes that a common skin bacterium, Cutibacterium acnes, may trigger sarcoidosis through a new mechanism called Endogenous Hypersensitivity Infection.

## Contribution

The paper introduces the novel concept of Endogenous Hypersensitivity Infection to explain sarcoidosis etiology.

## Key findings

- Cutibacterium acnes is frequently detected in sarcoid granulomas using multiple techniques.
- The EHI framework explains sarcoidosis as a breakdown of immune tolerance to latent commensal microbes.
- EHI may also apply to other chronic inflammatory diseases like Crohn’s and atopic dermatitis.

## Abstract

Sarcoidosis is an immune-mediated granulomatous disease whose etiology has remained unresolved despite more than a century of investigation. Accumulating microbiological and immunopathological evidence now implicates Cutibacterium acnes—a ubiquitous indigenous commensal—as the most consistent antigenic trigger. Its frequent detection within sarcoid granulomas by quantitative PCR, in situ hybridization, and species-specific immunohistochemistry suggests latent intracellular persistence and the potential for endogenous reactivation. To explain how a noncontagious commensal can drive granulomatous inflammation, this review proposes the concept of Endogenous Hypersensitivity Infection (EHI). EHI describes a host-centered process in which reactivation of latent intracellular microbes leads to the breakdown of immune tolerance and provokes Th1-dominant hypersensitivity responses in genetically and immunologically susceptible individuals. This framework bridges the traditional divide between infection and autoimmunity, reframing sarcoidosis as a disorder of disrupted host–commensal homeostasis rather than a classical infectious or autoimmune disease. By integrating microbiological, immunological, and pathological evidence, this review synthesizes the mechanistic basis of EHI and outlines how tolerance failure to C. acnes can account for the paradoxical clinical behavior of sarcoidosis. The EHI paradigm further provides a unifying conceptual lens through which related chronic inflammatory disorders—including Crohn’s disease, chronic rhinosinusitis, and atopic dermatitis—may be reinterpreted.