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Redness is a key sign of inflammation, explicitly listed among the five cardinal signs [1], observed at wound sites during inflammation [2], resulting from persistent inflammation in infected wounds [3], and present in inflamed joints [4].

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The 4 Stages of Wound Healing and Your Role in the Process essentiahealth.org General Surgery Team · Essentia Health 1 fact

claimSigns of inflammation at a wound site include mild swelling, redness, and warmth, which indicate the body is allowing healing cells to enter, removing damaged tissue and bacteria, and preparing the wound base for new tissue growth.

Healthy vs. Infected Wounds: A Clinician's Guide - Net Health nethealth.com Net Health 1 fact

claimPersistent inflammation in infected wounds leads to an increased release of pro-inflammatory cytokines that can damage healthy tissue, excessive redness and swelling that hinders nutrient and oxygen delivery, and impaired migration of fibroblasts and other cells essential for tissue repair.

Inflammation: Definition, Diseases, Types, and Treatment - WebMD webmd.com WebMD 1 fact

claimInflammation in a joint causes symptoms including redness, a swollen joint that may be warm to the touch, joint pain, joint stiffness, and a joint that does not function as well as it should.

Acute Inflammatory Response - StatPearls - NCBI Bookshelf - NIH ncbi.nlm.nih.gov National Library of Medicine 1 fact

claimThe five signs of inflammation are pain, redness, swelling, heat, and loss of function.