What could be diagnosed if a 20-year-old patient presents multiple white lesions on the tongue and complains of sore gums with a fever?

The diagnosis of Primary Herpetic Stomatitis is supported by the patient's presentation, which includes multiple white lesions on the tongue, sore gums, and fever. Primary Herpetic Stomatitis is commonly associated with the initial outbreak of the herpes simplex virus, particularly type 1. It typically manifests in young adults as painful oral lesions, often accompanied by systemic symptoms such as fever and general malaise.

The presence of multiple white lesions suggests ulcerative lesions which are characteristic of this condition, often appearing as vesicles that can rupture and form painful ulcers. Additionally, the involvement of the gums (gingiva) and the reported fever further align with this diagnosis, as Primary Herpetic Stomatitis frequently causes gingivostomatitis, which is inflammation of the gums and mouth tissues.

While other conditions like Oral thrush (caused by Candida) might also present with white lesions, it typically does not cause significant gum pain or systemic symptoms like fever to the same extent. Leukoplakia is known for being a premalignant condition characterized by white patches in the mouth, which are not usually associated with pain and fever. Oral lichen planus presents with white striations or patches but typically does not cause fever or major systemic symptoms