Hard Bumps After Sculptra on Forehead

Nodule formation is possible with Sculptra, and I tend to use this product primarily in the cheeks and temples. I do not use Sculptra in the forehead for this reason. I like to place Sculptra in the deep tissues, and the forehead has very little subcutaneous tissue to disguise any irregularities.
For any nodule formation, massage is generally the best place to start. Steroid injections, needle aspiration or manipulation, and surgical excision are other options. Be sure to discuss any post-injection concerns with your injector, and I always recommend seeing an expert physician injector.
All the best,

I recommend massaging the area 5x/day for 5 mins each time over the next 5 days.  If the bumps persist, I advise you see a board certified dermatologist or plastic surgeon for possible intralesional steroid injection.  

Firm scar massage is key, 10x every 4-6 hours. If the bumps remain persistent, seek a board-certified dermatologist to consider intralesional steroid and or 5-FU injection to break down the scar tissue. With appropriate dilution and injection technique by a board-certified dermatologist or plastic surgeon, Sculptra nodule should be quite rare.