Pimple under arm at point of surgery scar

I had non malignant fatty tissue removed from under my arms about 7 years ago. Recently I got a huge pimple actually 2 of them, right at the point of incision. They are painful and *****. Should I be worried or should I just use and antibiotic cream until they go away on their own? And why there? At the point of the incision?

[Dr_Aparna]

Hi,
This could be a case of folliculitis, not acne.Folliculitis is the inflammation of one or more hair follicles. The condition may occur anywhere on the skin.
Folliculitis starts when hair follicles are damaged by friction from clothing, blockage of the follicle, shaving.In most cases of folliculitis, the damaged follicles are then infected with the bacteria Staphylococcus (staph).
It presents as pimples or pustules located around a hair follicle which may crust over,
typically occuring  on neck, axilla, or groin area .
Topical antiseptic treatment is adequate for most cases but topical antibiotics such as mupirocin or neomycin containing ointment can also bring about a resolution.
ref:http://en.wikipedia.org/wiki/Folliculitis