What Normal Reactions Look Like Across large studies of injectable biologics, typical benign reactions include: Mild redness confined to 2-3 cm around the injection site Slight swelling or firmness (small lump or wheal under skin) Tenderness or itching improving within hours to two days Minor bruising or pinpoint bleeding Timeline: Onset within minutes to 24 hours, peaking by 24 hours, followed by improvement Clinical data shows these reactions occur in 25-45% of injections for some formulations and usually resolve within 1-3 days with simple care
Dec 2018;24(12):1064-1068
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Golatta, M., Schweitzer-Martin, M., Harcos, A., Schott, S., Junkermann, H., Rauch, G., et al