What should I do with Nodules/ Cysts after Dysport on forehead? Massage them? (photos)

Generally, the most insidious bacteria are atypical mycobacterium.  Usually these appear weeks after a treatment.  While uncommon, factors that are associated with them is the use of contaminated ice or tap water in association with the treatment.  The recommendation of having one biopsied and cultured is a good one.  You may need to find a different dermatologist to get the care you need.

Thanks for your question. This is a question that we
get asked often by our patients. The most common SIDE-EFFECTS of toxin
injections include: Swelling, Redness, and Bruising at the site of
injection. Complications are rare and only temporary, but may include
paralysis of other nearby muscles, temporary eyelid ptosis (dropping of
eyelids, 2% risk, lasts 2-3 weeks), temporary brow ptosis (dropping of
eyebrows, 2% risk, lasts 2-3 weeks), cross-eyes, ectropion or edema of the
lower eyelid, dry eyes, double vision, transient headaches (10%), local
numbness (lasting 2-3 weeks), flu-like symptoms, rash at the injection site,
pain at the injection site, infections, and bruising (need to avoid blood
thinning medications). Cold compresses may be used immediately after
treatment to reduce swelling only if needed. This may be applied for 3 minutes,
3 times per day, for up to 3 days. This is best done with a bag of peas in a
zip lock bag. Only apply light pressure to the area. Only take Tylenol if you
get a headache or migraine.

These are not typical bruises that one occasionally sees after a neurotoxin injection.  I would be concerned about the possibility of the product being contaminated with some type of bacteria.  This reaction should be reported to the manufacturer and needs closer inspection and assessment of potential underlying causes.  A very small piece of tissue might need to be removed to look at the skin under a microscope and possibly be cultured for various bacterial and fungal infections.