Could this be an allergic reaction after my breast augmentation a month ago? (Photos)

Thank you for sharing your question.  It does appear that you are having an allergic reaction.  It is possible that it was from the surgical glue, or what you were using to cover your incision.  Sometimes lotions, soap/bodywash, or laundry detergent can cause a reaction like this.  I would use Benadryl as directed on the package and follow up with your Plastic Surgeon when their office opens.  Good luck.  
Best Wishes,
-Dr. B.

Hi there,

I don't think this is an allergic reaction related to silicone breast implants but likely a result of a reaction to your dressings, tape or creams you may be using to massage.  It may even be a reaction to any mediation or antibiotics you are taking.

I would stop using any product on the area and consider a antihistamine orally.  Rashes usually resolve without impacting on wound healing, but I do agree with avoiding a steroid cream.

Sit tight and let things settle down. You may not identify the specific causative agent.  Your local GP is a good idea for an opinion while your surgeon is away.

All the best.
Richard