For acne cysts on the face, it is safer to use 1 to 2 mg/mL to make sure that atrophy does not occur. On the trunk consider using 2 to mg/mL of triamcinolone. Enough suspension should be injected to see and feel the cyst become distended, but no more than mL is needed for any one cyst. One injection site per acne cyst should be adequate. If the cyst is large and soft, do not inject more volume because that can lead to atrophy. If there is a lot of purulent material inside the cyst, a quick incision and drainage (with lidocaine and a No. 11 scalpel) before injecting the steroid may be helpful.
Information from the National Library of Medicine
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Ages Eligible for Study: 18 Years to 59 Years (Adult) Sexes Eligible for Study: All Accepts Healthy Volunteers: No Criteria Inclusion Criteria:
The pathogenesis of hypertrophic scars and keloids is incompletely understood. It involves alterations in the sequential process of wound healing and may be influenced by multiple local and genetic factors [ 8-10 ]. In normal wound healing there is an initial marked local inflammatory reaction, followed by the formation of new blood vessels, activation of keratinocytes and fibroblasts at the edge of the wound, and synthesis of extracellular matrix components [ 11 ]. After the reepithelialization is completed, the dermal granulation tissue is remodeled into a scar and the replacement tissue adapts to biomechanical requirements. (See "Basic principles of wound healing" .)