Potential risks Serious risks and adverse events include: Allergic reaction to the medications or dye used in the injection Shoulder infection Depigmentation of the skin around the injection site (a whitening of the skin) Local fat atrophy around the injection site (thinning of the skin) Rupture of a tendon located in the path of the injection Nerve damage near the shoulder joint Bleeding at the injection site In addition to the above, corticosteroid injections increase the risk of: High blood pressure High blood sugar Decreased immune function Decrease in bone mineral density Bone infection (osteonecrosis) Reproductive hormone imbalance Metabolic changes (eg, increased appetite, weight gain, and fluid retention) These risks are typically associated with higher doses of corticosteroids, multiple injections, and for people with underlying medical conditions such as diabetes and heart problems
Chen, F., Kang, R., Liu, J
The FDA label includes a boxed warning regarding thyroid C-cell tumors observed in rodent studies, contraindicating use in patients with personal or family history of medullary thyroid carcinoma or Multiple Endocrine Neoplasia syndrome type 2
Vitamin C can help reduce the appearance of freckles, but it may not completely get rid of them