Thanks for such a detailed history.
I am an ENT doctor and can help you.
How long you have used mupirocin and did the pimples appeared after their use?
Do you have habit of nose picking or scratching?
Thanks for your reply.
The condition you are having is recurring boil nose. The same place occurrence is probably due to infection of a same hair follicle,its not necessary to have an ingrown hair with examination. The response to mupirocin also indicate that its bacterial. You need to have a swab taken from your nose for culture and sensitivity and with that the bacterial flora can be seen , you might be having an abnormal flora and you can get antibiotics accordingly. Since you are not developing such boils at other body parts so source of infection somewhere else is less likely. You need to take certain precautions also like washing your nose periodically with water to keep the area clean. Never pick your nose specially when you are having a boil. Try to visit your ENT when you have a boil so that he may assess it at that time , i know its difficult to get appointment but this is something required. Apply mupirocin as soon as you feel that you are going to get the boil like you may slight pain or irritation before getting it. But keeping nose cleaned by water periodically will help you.
Donot worry there is nothing serious.
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Thats good that you are already taking care of these things, i wish you good luck with your visit and recovery. Ask him for a swab also as i have mentioned