Intralesional injection, the direct delivery of medication percutaneously into skin lesions, has been an important part of dermatologic therapy since it was first introduced in 1961. Intralesional injections are effective for a wide range of indications, are easily performed, and are relatively safe. The rationale for intralesional therapy is simple: to deliver a medication directly into a specific skin lesion to treat local tissues with minimal systemic effects. The skin also serves as a reservoir, allowing medication deposited in the dermis to be delivered over a period of time, resulting in prolonged therapy while avoiding or minimizing the adverse effects of systemic therapy.
Intralesional steroid is used for localised inflammatory, hyperplastic, and hypertrophic lesions

• Keloid and hypertrophic scar