After laser resurfacing, mosquito bite-like lumps appeared on my chin! What’s happening? (photos)

Thank  you for your question and photos. It is not unusual to experience side effects like yours after a laser treatment. Use a gentle wash on the area, and avoid harsh products that could irritate the skin further. My guess is you will see improvement in those bumps within a couple of weeks. If not, I would schedule a follow-up with your doctor for an in-person assessment and treatment recommendations, should that become necessary. 

Skin reactions such as this are relatively common post laser resurfacing. If these don't subside within 2-3 weeks, I suggest scheduling a formal follow up with the rendering physician. Best, Dr. Emer. 

With laser resurfacing, the glands are inflamed initially and may not work well.  At about 2-3 weeks the glands can then become hyper active and people will get Milia or little breakouts.  Yours may be a similar issue, but under the skin.  Doxycycline usually works well to help control these.  Try not to pick at them and don't use any strong creams or solutions as they can irritate the new skin even more.