I had a boil under the left arm I did a surgery on oct last year and the doc remove my sweat gland but present the boil appears again?

Boils. Apparently staphylococcus bacteria are colonizing your armpit making you susceptible to recurrent boils. Sometimes a course of a potent antistaphyloccus antibiotic for 10 to 14 days is needed to eradicate these bacteria colonizing your skin. Discuss this with your physician if further boils occur.