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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.

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Background. Secondary solid cancers are severe complications in patients who have undergone allogeneic hematopoietic stem cell transplantation (AHSCT) for malignant and nonmalignant lymphohematopoietic diseases. Objective. The aim of this work was to report a case of two lip carcinomas following AHSCT and to warn doctors about the importance of regular check-ups of patients who have received HSCT. Observation. A 57-year-old man was referred by the dermatology department for the management of exophytic budding lesions on the lower lip evolving since 5 months. The patient was in complete remission following allogeneic bone marrow transplantation for acute myeloid leukemia since five years. Clinical and histological findings confirmed the diagnosis of a squamous cell carcinoma of the two lesions. Conclusion. It is of paramount importance to seek an oral squamous cell carcinoma in the presence of persistent lesions in HSCT recipients.

Stevens-Johnson Syndrome (SJS) is a rare and severe mucocutaneous disease characterized by widespread epidermal necrosis and mucosal involvement affecting children and adults. It is an immune-mediated disease usually secondary to drug reaction, but in few cases it is an extrapulmonary complication of Mycoplasma pneumoniae infection. We report a case illustrating that the incomplete Steven-Johnson syndrome associated to Mycoplasma pneumoniae infection may present with skin and oral mucosal involvement alone without conjunctival or genital involvement.