1. Introduction Injection site anesthesia refers to a localized loss of sensation occurring immediately or shortly after a medical injection. This sensory deficit is primarily the result of direct mechanical trauma to a peripheral nerve fiber, chemical neurotoxicity from the injected substance, or localized tissue compression secondary to fluid accumulation. Most cases are transient and … Read more
1. Introduction Injection site atrophy describes a localized depression or thinning of the skin and underlying subcutaneous fat tissue following a medical injection. This structural change manifests as a visible indentation, commonly referred to as lipoatrophy, and is often accompanied by changes in skin pigmentation or texture. The condition arises when the injected pharmaceutical agent … Read more
1. Introduction Injection site dermatitis refers to a localized inflammatory skin reaction occurring after a medical puncture or the topical application of preparatory agents. This condition manifests as a defined area of erythema, pruritus, and occasionally vesiculation precisely where the skin was exposed to the offending agent. The biological basis of this localized inflammation rests … Read more
1. Introduction Injection site irritation refers to a localized, benign inflammatory response within the cutaneous or subcutaneous tissue immediately following a medical puncture. This condition manifests as a circumscribed area of erythema, mild edema, and a localized stinging or burning sensation that typically resolves without intervention over several hours to days. The physiological basis of … Read more