what is erythematous mucosa in the mouth
Confidence votes 50.7K. RN, FNP. Erythematous mucosa means red mucous membranes. For instance, if you had a sore throat, you might have erythematous mucosa. mucosa is a moist tissue that lines your nose, mouth, lungs and digestive tract. glands along the mucosa releases mucus that protect you from pathogens.ucosa is a moist tissue that lines your nose, mouth, lungs and digestive tract. glands along the mucosa releases mucus that protect you from pathogens.