Who should not get filler?

Hyaluronic acid (HA) dermal filler has several contraindications that most promotional content doesn't surface clearly: active infection at or near the injection site, hypersensitivity to HA or to lidocaine (present in most HA formulations), pregnancy and breastfeeding, and certain autoimmune conditions in active flare. Timing matters independently of underlying medical history — dental procedures and vaccinations within 2 weeks of filler carry documented risks that both patients and providers need to account for before scheduling. Candidacy is a medical determination, not a booking question.

Medical contraindications — absolute and relative

Active skin infection at the intended injection site is an absolute contraindication. Herpes simplex labialis (cold sores), active impetigo, cystic acne, and bacterial folliculitis all represent local infection that needling would introduce directly into the tissue planes where filler is placed — risking abscess formation, cellulitis, or, for herpes simplex, a reactivation event triggered by the procedural stimulus. Patients with a personal history of herpes labialis should disclose this before lip or perioral filler; prophylactic antiviral therapy (acyclovir or valacyclovir, typically begun 2–3 days before the procedure) is the standard protective measure. Any active infection anywhere on the body, not just the face, elevates systemic inflammatory risk and should prompt rescheduling until resolution.

Autoimmune conditions require individualized assessment rather than blanket exclusion. Systemic lupus erythematosus (SLE), Sjögren's syndrome, and scleroderma in active flare carry elevated risk for foreign-body granuloma formation — a localized immune reaction to filler material in which macrophages encapsulate the product, producing firm nodules that can be difficult to treat. Patients with autoimmune conditions who are stable on medication are often appropriate candidates; the clinically relevant factor is disease activity, not the diagnosis itself. Hypersensitivity to lidocaine — the local anesthetic in most HA filler formulations — must be disclosed; reactions range from localized allergic dermatitis to systemic anaphylaxis. Pregnancy and breastfeeding are standard contraindications; HA filler has not been studied in these populations.

Timing: dental procedures and vaccinations

Dental procedures create a risk that most filler patients aren't warned about. Routine dental work — prophylaxis, restorations, extractions — seeds bacteria into the bloodstream through a process called transient bacteremia. Because HA filler is a foreign-body substrate, bloodborne bacteria can deposit on the filler and establish a biofilm: a persistent, treatment-resistant infection that typically presents weeks to months after the procedure as swelling, firmness, or pain at the filler site — long after both the dental appointment and the injection are forgotten. The clinical guidance is a 2-week clearance window on both sides: no dental work within 2 weeks before or after filler. Patients with upcoming dental appointments should schedule filler well outside that window in both directions.

Vaccination introduces a separate risk mechanism: delayed inflammatory reactions (DIRs). A DIR occurs when an immune activation event — vaccination, illness, or another injection — triggers the immune system to mount a response at HA filler depots (a foreign-body substrate), producing redness, firmness, and swelling at old injection sites. DIRs were well-documented following mRNA COVID-19 vaccination and have been observed with other vaccines as well. The mechanism is immune activation localizing to a foreign-body site — not an allergic reaction to the vaccine itself. DIRs are manageable: antihistamines and a short course of oral corticosteroids typically resolve them within days, and persistent reactions can be treated with hyaluronidase. The practical guidance is 2 weeks between filler and any vaccination, on either side.

Unrealistic expectations — a soft contraindication

Appropriate candidacy involves more than a medical checklist. Filler delivers precisely defined outcomes: it adds volume, provides structural support to specific tissue planes, and reduces the appearance of static rhytids (lines present at rest) that have a partial volume component. It does not lift significantly ptotic (descending) tissue, does not reverse significant cutaneous laxity, and does not produce the structural correction available from surgery. When a patient's goal — marked jowl reduction, significant eyelid correction, or dramatic facial lifting — requires what filler cannot provide, proceeding with filler is not a neutral decision: adding volume to tissue that also needs repositioning often produces an outcome that reads unnatural rather than restored.

This isn't a reason to withhold filler from patients with complex anatomy — it's a reason for the provider to map what the treatment can and cannot accomplish for that specific anatomy and goal, and to refer when a different modality would serve the patient more honestly. A patient whose goal won't be met by the treatment available is not a good candidate for that appointment, regardless of medical clearance. Honesty at consultation is part of the clinical standard of care, not an obstacle to it.

Common questions

This is general information, not medical advice; candidacy and timing are determined by a licensed provider at consultation.