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Thank you for attaching the pictures (attachment removed to protect patient identity), and I completely understand your concern.
In most cases, such lesions are seen due to sexually transmitted infections like candida and gonorrhea. But as you mentioned, you have not been involved in any intercourse for six months. It can be due to candida only as it is a common fungal infection seen in most cases.
I am prescribing you five days medications and will see after that. Take tablet Cefixime 200 mg twice a day after meal for five days, tablet Cetirizine 10 mg once a day after meal for five days. Apply Beclomethasone Clotrimazole cream on the affected area three times a day after cleaning.
Do you have any history of herpes or any lesions on the lips? Please answer so that I can prescribe further treatment.