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Epidermoid, dermoid and teratoid cysts are nonodontogenic benign lesions derived from the germinative epithelium, appearing any where of the body. In the oral cavity, these are uncommon and account for less than 0.01% of all the oral cysts. These cysts often remain asymptomatic for years however can become acutely symptomatic.

The World Health Organization (WHO) classifies odontomas as odontogenic tumors, consisting of odontogenic epithelium and ectomesenchyme. They result from developmental abnormalities and, therefore, do not constitute authentic tumors. It is a local malformation that has no growth autonomy. They are rarely symptomatic and are usually discovered accidentally during the realization of a radiographic examination. There are two variants of odontomas: complex and compound. Complex odontomas are made of a mass consisting of an anarchic assembly of mineralized tissue (enamel, dentin, and cementum) and dental pulp; while compound odontomas are consisting of a set of small rudimentary teeth, assembling in clusters. They rarely show the features of both types together. The aim of this work is to report a rare presentation of an odontoma in a 24‐year‐old male patient, which present the characteristics of both complex and compound variants. Surgical excision of the lesion was performed. Anatomopathological examination confirmed the diagnosis. Clinical and radiological survey does not show any recurrence.

Erythema multiforme is a reactive inflammatory mucocutaneous disorder. It is classified into three groups: erythema multiforme minor, major, and oral erythema multiforme. The oral mucosa is mostly involved. The etiology of this lesion varied from bacterial, viral, or fungal infection to drug reaction. The aim was to report a case of oral erythema multiforme related to drug intake, in order to highlight clinical and histological features in addition to therapeutic modalities of drug‐induced oral erythema multiforme. A 74‐year‐old female patient consulted for painful ulcerations in the oral cavity, associated with burning sensation and inability to eat or swallow for the past 8 days. After detailed anamnesis and clinical examination, the diagnosis of oral erythema multiforme related to drug intake was retained. Oral erythema multiforme is a benign inflammatory disorder involving the oral mucosa with pathognomonic clinical and histological features. It may result from viral, bacterial, or fungal infection and from drug intake reaction. The interruption of the implicated molecule associated with symptomatic treatment is the principal therapeutic modalities.

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