After Coolsculpting, I Have a Rock Hard Lump??

Inflammation, seroma (clear liquid swelling), fat necrosis, doubtful hernia, cyst are all possibilities. You should be seen and not deal with this by telephone. Let the phsyician examine you. 

Many patients develop tender nodules temporarily in the first couple of months that self resolve and is a normal process of the body taking care of the dying fat cells. In my NYC practice, for the rare patients that notice the tender nodules, external ultrasound energy is delivered as a massage and this helps to reduce the inflammation.

The information provided in Dr. Shelton's answer is for educational purposes only and is not intended to constitute medical advice.  The information provided should not be relied upon as a substitute for consultations with a qualified health professional who may be familiar with your individual medical needs.

I would go in to be evaluated so that they can physically see and feel if it is normal inflammation causing some underlying induration or something else.

Thank you for your question. The firmness tends to dissipate over several weeks, and at 6-8 weeks, most if not all is dissipated. I hope this helps.