Alcohol tincture w/ sage. Rosemary added helps but either way it'll kill the infection. 80 proof works fine but the higher the alcohol the quicker the tincture and better bacterial killing power.
I keep a bottle like this of 40 proof
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Sage, rosemary, thyme and oregano all have antibacterial properties but sage is the best. Keep applying throughout the day until swelling is gone. Underlying problem still needs care but you won't have to take their damn antibiotics that fuck up our systems