Hello Fugino72, from the history that you have given it appears like you are having recurrent furuncles
. You have not mentioned how many times you were treated with antibiotics and whether you completed full course. Diabetics tend to get this problem more often, that is why your doctor checked your sugars. It can occur in non diabetics too. You need to complete a full course of antibiotics which cover for staphylococcus aureus
as this is the most common bacteria implicated. Even after that if it recurs i will suggest you do a pus culture and sensitivity test which will accurately identify the bacteria and also the antibiotic which works the best. Some of these bacteria can have a chronic carrier state at certain sites and a dermatologist
will be able to help you in treating carrier state. Hope this helped. Take care.