Recent Brachioplasty - 2 Wks Post Op. Small 1' Opening Still Not Healing Quickly...

Unfortunately the arm pit is a difficult area to heal because of frequent motion and high normal bacterial counts, sweating, etc. Arm lifts therefore occasionally have problems like this, especially in the axilla (arm pit).
The most common reason would be absorbable sutures that are reactive and being pushed out  through the the skin but an infection could also be the cause.
The good news is that your arm lift will heal. It just needs more time.
See your board certified plastic surgeon to be checked.

I know this must be a concern for you, but it is unfortunately very common post armlift for patients to have openings occur. You should first consult your surgeon with this issue and they will give you proper instructions on how to take care of your opening in order to properly heal your wound.

When this occurs to my patients I will have them increase their protein levels and to make sure they are packing and doing dressing changes twice a day. Keeping the area clean is essential.

If for any reason the scar does not turn out favorably, you can have your surgeon perform a scar revision or you can consult with another board certified plastic surgeon about your revision. Whichever you prefer if it happens to occur.

I have included a link below that may be of interest to you. Best of luck.