Objectives: To report the case of a rare dermatological disease, demonstrating its possible clinical and immunohistochemical variations. Methods: Information for carrying out the case report was communicated through medical records made available by Carapicuíba’s General Hospital after approval by the institution's Ethics Committee and literature review. Discussion: We report the case of a 68-year-old white man, retired, with a history of erythematous plaques and with a very itchy scalp for 6 months. Having the clinical suspicion that a cutaneous lymphoma may be involved, an incisional biopsy was performed. Histopathological analysis and subsequent immunohistochemistry showed polyclonal lymphoid dermal infiltrate, and the diagnosis of cutaneous lymphocytoma or the most common subtype of pseudolymphoma was concluded.