After I have Botox I seem to get horn style lumps over both ends of my brows. Can more Botox be injected to stop this? (photo)

Thank you for your question and photograph.  This result is because the tail of your muscle is a bit more lateral.  Your injector will need to adjust placement and units for correction.   Best of luck.

The most plausible reason for the response you have experienced with Botox is that your Coorugator muscle extends more laterally than most.  An additional amount of Botox placed in the region may solve your problem. 

Thank you for your question.  It is possible that too much botox in your forehead is causing the skin and muscle to drop, resulting in what you pointed out in your photo.  In my experience, patients can have a low brow to begin with, and giving botox to the forehead can make the brow fall lower.  There are techniques to inject botox so that the brow is gently elevated in a natural way.  I would look for a doctor that is familiar with this approach.

Thank you for your question.
The reason for you "horn" is that the injector has not chased the whole muscle so the tail of the muscle has not been injected. This will not drop your brow if injected directly into the muscle. 
The tail of the muscle looks more obvious as the rest is of the muscle is not working and it tries harder so its more active. 
easily fixed!
Talk to your injector.
Hope this helps

It looks like your frown muscles extend more laterally than typical.  You will need more lateral placement of botox.  I would recommend showing these photos to your injector so that proper adjustments can be made.  

This is occurs because your muscle extends more laterally than most. By placing the botox more laterally this should relax the muscle and solve the problem. Discuss this with your injector so that they will be aware that this is happening.

This occurs because the injections are not done lateral enough and most doctors are not correctly trained to treat this area.  see a board certified dermatologist and discuss this issue

Your forehead result after Botox is a result of swelling and fluid that gets trapped in the injection plane of the forehead facia, and stops at the zones of adherence on either side of the forehead/ temple region.
Less Botox is better. Injection deeper into muscle may also help.
Kristine Brecht, MD
Seattle, WA