Showing, characterized by, or relating to erythema; having redness and inflammation of the skin as a prominent feature.
From erythema with the adjectival suffix -ous meaning 'full of' or 'characterized by.' This is the most common modern medical English form for describing erythema-related conditions.
You'll see 'erythematous rash' constantly in medical notes—it's such a common descriptor that dermatologists abbreviate it to 'EM rash' in patient documentation, making it one of the most frequently written medical terms!
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