After my second Infini that I had 2 weeks ago, I have strange reaction on my neck that looks like raised bumps? (photo)

I have been using Infini in my practice for almost 4 years, and I have seen this transient side effect of tiny bumps (at the needle insertion sites) twice.  In both cases, the bumps were on the neck and completely resolved within one month (prior to the subsequent treatment session) without intervention.  Infini is a very effective device;  I use the device most often to treat crepey (finely wrinkled) skin on the front of the neck and for acne scarring.

Sometimes little things like this happen. Whether the skin is reacting this way temporarily or this is a side effect that will require intervention can only be determined by someone taking a look in person. However, if these are a semi-permanent reaction, they can be treated with chemical peels, fractioned ablation (Profractional) or a similar laser. For now get some silicone gel (over the counter) and use that twice a day. 

This is not an uncommon reaction. Inflammatory responses can cause these bumps.  A steroid ointment applied twice a day will settle these bumps down. Please be patient, this is not a permanent sequelae of the procedure.