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The photos are not at all clear to give exact diagnosis (attachment removed to protect patient identity). You should start taking antibiotics like Amoxicillin and Metronidazole for five days to reduce the gum swelling. If you can buy medicine over-the-counter then buy the following;
1. Capsule Amoxicillin CV 500 mg (combination of Amoxicillin and Clavulanate) thrice daily for five days.
2. Take Betadine gargle or warm saline gargle thrice daily.
3. Send a good picture also. Consult a dentist and ask about flap surgery for the affected area.