Lip Lesion - You Be The Doctor

This 76 year old woman had a long-standing sore on the border of her lower lip. It was not tender and she denied any trauma or known exposure. What is the diagnosis?1. Leukoplakia2. Squamous cell carcinoma3. Contact dermatitis to oral hygiene products4. Oral lichen planus5. Apthous stomatitisMake your diagnosis and the answer will be posted tomorrow.(from Consultant)