Dr. Sam Lam Plastic Surgery Forum

she got a hematoma. that is why i pre-ice with a special icepack for 1 minute before i inject and i use tiny needles. without the ice, it sounds as if she got a hematoma (blood clot). it will take a while for that to resorb. fortunately, i have not seen one of those in years since i have done my icing technique. it should not hurt at all after injection.
best,
sml

first, resistance is very rare today especially for cosmetic doses including the masseter. when using several bottles for neck dystonias, you have a higher risk. however, since the reduction of the blocking protein in 1998, there has been a sixfold decrease in resistance in those patients receiving massively high doses. in one study published in 2003, they found 4 of 42 patients who used the pre-1998 formulation had resistance (9%) when treating cervical dystonias compared with 0 of 119 using the current formulation that reduces blocking antibodies by 1/5th.

if it is just swollen and not a lump then it sounds more like just swelling than a hematoma. I really should refrain from further commentary and you should ask your doctor because in my hands I do not see these outcomes in my patients.