Side Effects After Botox in Forehead - Are They Permanent?

Hi Kingston.  Bruising after Botox is quite rare for experienced injectors - at least in relation to the possibility of bruising with dermal fillers.  

Whether this is bruising (or hemosiderin staining) as mentioned below, there are alternatives that have not been addressed.  Within two days of a deep bruise from any injection, we use pulsed dye lasers to quickly reverse the bruising.  After two days though, the treatment window closes and the bruise cannot be reversed easily.  The bruises typically resolve with 48-72 hours after V-Star pulsed dye laser treatments.

If the bruising has been there for quite some time (hemosiderin staining), then a q-switched Nd:Yg laser may be more appropriate.  We have used these lasers to remove staining from injection procedures as well as from sclerotherapy injections.  Hope this helps and good luck.

It is impossible to answer your question without seeing you in person and examining the lesion with high magnification.  What is unusual is to believe that there is a growth that the injection caused.  The needles commonly used to inject Botox are so tiny in diameter that there are no marks left.

It is impossible to know exactly what is going on without examining you.  In general, however, it sounds like you may have post-inflammatory hyperpigmentation.  After any injections you can have bruising.  Bruising can take 5 days to even 2 weeks to completely disappear, depending on how big and how deep the bruise is.  The bruise can also cause some inflammation in the skin.  This can make it look a little red at first but it may look brown after the inflammation has gone away.  This is the same thing that happens when you get a brown mark after a pimple or a scratch.  With some time it should fade to your normal color.  Be sure to use sun protection as sunlight will prevent this from fading and could even make it worse.