Erythema after harmonization: what it is and when to worry

Erythema is redness of the skin caused by the dilation of small vessels and increased blood flow in the area. It is a classic sign of inflammation. After injectable procedures, mild, localized erythema is an expected response to the trauma of the needle, to manipulation and to the product.

What is expected?

Ordinary erythema appears right after the application, around the injection points or in the treated area, and usually fades within hours to a few days. It may come with mild swelling and small bruises. Fair, sensitive skin, and procedures with many punctures, tend to show more redness.

When should erythema raise concern?

• Redness that gets worse as the days go by, with warmth, pain and hardening: it may indicate infection.
• Late erythema, weeks later, with nodules: part of the diagnosis of a delayed inflammatory reaction or biofilm.
• Plaque-like or lacy redness, purplish, with pain or surrounding pallor: it may be a sign of vascular occlusion, which needs immediate care.
• Erythema with itching, hives or diffuse swelling: it may indicate an allergic reaction.

How should the patient be advised?

Explaining what is expected, for how long, and which signs justify getting in touch right away reduces anxiety and speeds up the identification of problems. Taking photos after the procedure helps follow the progress. The management for each condition is defined by the qualified professional, after assessment.

The guide on safety and complications brings together the most common complications.

Also called: redness, flushing.