Why is my face covered in blisters after Botox 2 weeks ago and how do I treat them? (Photos)

It is most likely a skin infection. The area above the inner aspect of your left eyebrow is particularly suspicious for infection. I would suggest to see your provider as soon as possible for antibiotic treatment. 

This appears to be a skin infection, perhaps due to inadequate cleaning of the skin,  injection through existing infection/acne, non-sterile injection technique or contaminated Botox. Consult your doctor immediately for antibiotic treatment. 
Best wishes