Forms of a localized erythema can be observed occasionally as an expression of inflamed gingiva. It is characterized by a localized sharply demarcated and painless swelling of the gingiva with considerable redness. The differential diagnosis is not unequivocal and appropriate diagnosis and therapy are a challenge. In the present case presentation we report on three cases, which showed good disease remission after simple antiseptic prophylactic measures. Based on the available literature possible etiologic factors are reviewed and a pragmatic treatment strategy is discussed.