Hello, It is my pleasure to help you, I had gone through your history and understand your concern. As you are having very painful sore in the left nostrils you can try some of the methods at home,best way to get relief from painful sore in nose is to Apply cold fomentation. Avoid nasal sprays and chemical fumes You can also apply a thin film of moisturizer in the inner lining of the nose to prevent dryness. For boils and furuncles in the nose, you should take prescribed antibiotics and analgesics from your treating doctor, don t take any medicine over the counter. It is very important when the sores recur frequently. Hope you got the solution for the query. Feel free to ask the query. Thank you.