History, examination and — when needed — a biopsy.
Diagnosis is based primarily on a thorough medical history and physical examination. In some cases the doctor may recommend taking a small sample of the affected tissue for histopathological examination. This confirms the diagnosis, rules out other causes of the lesions and helps choose the right treatment.
Regular check-ups are also important because chronic, untreated lesions require oncological surveillance. The risk of developing squamous cell carcinoma is low, but it calls for vigilance and medical follow-up.
