I have Hashimoto's Thyroiditis (autoimmune thyroid disease). Are Kybella injections OK for me?

It is important to understand that Kybella is best for doctors who do not do liposuction and for patients who are not open to having liposuction.  Most marketing for Kybella seem to suggest that a single treatment makes a difference.  That is far from accurate. In clinical studies, 60% of patients needed 6 kybella sessions each one month apart.  At the end of that series of treatments, only 60% of patients were satisfied with the result.  That is a huge expense of time and money for a service with a 40% likelihood of outcome dissatisfaction. Neck liposuction is a remarkably comfortable, minimally invasive procedure that can be performed under local anesthesia.  I prefer to perform it under a brief intravenous sedation.  In one session, the localized fat can be removed with a single session of liposuction.  The procedure is, in my opinion, much more comfortable to recover from with less swelling than kybella service.  The ads are cute but you must look more closely to decide if this treatment really makes sense.  Also be aware that many people at your age do benefit from a face lift which should include neck work which includes the liposuction.
The stable history of Hashimoto's should not present a problem for cosmetic surgery.

There should not be any effect on the thyroid gland from being treated with Kybella under the chin.  So, there is no reason that someone with Hashimoto's Thyroiditis or any other thyroid disorder could not be treated.  

Kybella is a bile acid and a naturally occuring substance that should only treat fat and not have any effect on the thyroid gland.