Thank you for your medical query at AskTheDoctor.com
I understand your concern.
I need a few more details for me to able to guide you. When did you first notice the swelling? Was it because of some injury? Is it painful? Do you have any history of previous STDs like herpes?
The area that I can see indicates a recent ulcer, and the blood has clotted inside indicating that the ulcer has been there for the past few days. You need to consult your physician who can examine the lesion directly. Application of an ointment like Xytee ( Metronidazole ) gel will be helpful in relieving the ulcer pain. Please consult your physician and if required a systemic antibiotic prophylaxis can also be started till the ulcer settles down.
Hope this was helpful,
Feel free to discuss further,
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