Injection site reactions are allergic reactions that result in cutaneous necrosis that may occur at sites of medication injection, typically presenting in one of two forms, (1) those associated with intravenous infusion or (2) those related to intramuscular injection. Intra muscular injections may produce a syndrome called livedo dermatitis

Livedo dermatitis

Livedoid dermatitis occurs immediately after an intramuscular injection, and is characterized by intense pain and blanching of the overlying skin, known as ischemic pallor....

.