Oral Localized Lesion on the Tongue in an Immunocompetent Individual: A Report of a Rare Case With a Comprehensive Review of the Literature

Histoplasmosis (HP) is a sporadic deep fungal disease that rarely shows oral lesions in various clinical forms. It is usually associated with immunocompromised states, but oral HP has also been reported in many immunocompetent individuals. An unusual case of focal oral HP in a 65-year-old immunocompetent male is reported from New Delhi, India (non-endemic region) presenting with oral ulcerative lesions on the floor of the mouth and lateral surface of the tongue. This case report highlights the importance of prompt diagnosis for the success of the treatment of oral HP along with a thorough review of the literature on HP in immunocompetent patients with oral manifestations. The average age of immunocompetent patients with oral HP is 49.65 years with a marked male predilection. The most common intraoral site is the tongue, followed by the gingiva. Also, five intraosseous cases of HP in immunocompetent patients are reported, among which four are seen in patients from Africa and in a much younger age group (mean: 17.25 years).