The majority of side effects are mild and temporary. The common side effect  we have seen are:

• Swelling around the treatment area. The swelling  occurs because  your body is responding to Belkyra and destroying the fat cells. More swelling usually means a better result with fat destruction.The swelling usually lasts between 3-5 days. 
• Numbness in the treated area. The area under the chin may be slightly numb for a few weeks to a month after the treatment
• Heat & Redness. The treated area may feel warm and red for a few hours after the injections
• Lumpiness in the treated area Some firm lumpiness can be felt which usually resolves within 4-6 weeks

Other common side effects include

• Bruising (increased if any blood thinners have recently been used)
• Pain
• Itchiness