The History You Did Not Take
Almost every injectable course teaches the consultation. It teaches consent, photography, expectation-setting and the assessment of the face — and inside all of that, the medical history usually appears as a form the patient completes in the waiting room while the previous appointment finishes.
That is a strange place to put it. Of everything gathered before a treatment, the history is the part most likely to change what you do, and it is the only part routinely delegated to the patient, unsupervised, on a clipboard.
What follows is not a screening form. It is an argument about which questions do real work, why several of them are about timing rather than eligibility, and what to make of the answers that come back empty.
Most of the form does nothing
A typical aesthetic history asks about allergies, medication, past medical history and pregnancy, and then never revisits any of it. The information is collected because it would look bad not to have collected it, which is a legal instinct rather than a clinical one — and it produces a document that satisfies an insurer while changing no decision.
The consensus literature on preventing filler complications takes a narrower view. It treats patient selection and history as the point where avoidable adverse events are actually avoided, ahead of technique, and it is specific about the categories that matter: active infection at or near the site, immunosuppression, autoimmune conditions, a history of adverse reaction to previous treatment, and recent or planned procedures elsewhere [1]. Those are not the categories most forms are built around.
Several of the important questions are about timing
This is the distinction that gets lost. A question like "have you had dental work recently" is not asking whether the patient may be treated. It is asking whether today is the day — and a question that only has a temporary answer needs to be asked differently from one that does not.
Isotretinoin is the clearest worked example, because the field's own position on it has moved. A systematic review with consensus recommendations examined the long-standing practice of deferring procedures for a fixed interval after treatment and found that the evidence supporting that delay was considerably weaker than its status in practice suggested, particularly for superficial interventions [2]. The authors did not conclude that timing is irrelevant. They concluded that a blanket interval applied to every procedure was not supported by what had actually been demonstrated.
Read that as a lesson about the shape of the answer rather than about one drug. A history question inherited as a fixed rule — wait this long, refuse in this case — is worth checking against what the rule was built on, because some of these rules are firmer in textbooks than in evidence.
Systemic events are a filler question now
Vaccination, viral illness and dental procedures have moved from the margins of the aesthetic history to somewhere nearer the centre, because they recur in the reports of delayed inflammatory reactions to hyaluronic acid [3]. The proposed mechanisms remain hypotheses, built to explain small numbers of cases, and none of them justifies refusing to treat a patient who had a vaccination last month.
What they do justify is asking, recording the answer, and telling the patient what to expect. A patient who knows that a systemic immune event can occasionally provoke a reaction at an old filler site will telephone rather than panic, and will arrive with the useful part of the history already assembled.
Herpes simplex reactivation is the older and better-established version of the same principle. Prophylaxis before facial procedures in patients with a relevant history has been studied since the 1990s, and the study design in that literature was strong enough to make it standard practice in the specialties that adopted it [4]. It works because someone asked the right question at the right time, not because of anything done during the procedure.
What the evidence does and does not support
Very little of the aesthetic history has been tested as a screening instrument. Most of what is recommended comes from consensus panels reasoning from adverse event reports and from adjacent specialties, and consensus is a way of organising expert opinion rather than a substitute for evidence [1][5]. Where a recommendation here is firm, it is usually firm because the underlying condition is well characterised, not because anyone has demonstrated that asking about it improves outcomes in aesthetic practice.
So the honest statement is narrower than it sounds. Taking a careful history is very likely to help and cannot plausibly harm, but nobody has run the study that quantifies what it prevents, and any provider who tells you their screening protocol reduces complications by some percentage is quoting a number that does not exist.
That absence is not a reason to do less. It is a reason to be careful about how the practice is described — to a patient, in a record, and in the marketing of a course. Screening is a defensible standard of care that rests on reasoning from known conditions, and describing it that way is both accurate and sufficient. Dressing it in a statistic it does not have makes an honest practice look like a claim.
The blank answer is a finding
A form returned with nothing ticked is the commonest result in aesthetic practice, and it is usually read as a clear history. Sometimes it is. Often it means the patient did not understand that a supplement counts as a medication, or that a condition managed for years still counts as a condition, or that they did not want to write down something they would have answered out loud.
The fix is not a longer form. It is asking two or three of the questions again, verbally, while looking at the person — which takes under a minute and changes the answer often enough to be worth the minute.
There is a version of this that goes too far, and it is worth naming. A practitioner who treats every empty form as concealment turns the consultation into an interrogation, and patients respond to that by disclosing less rather than more. The useful posture is closer to ordinary curiosity: you are not trying to catch anyone out, you are trying to find out whether the thing you are about to do is the right thing to do today. Patients can tell the difference, and the ones who feel examined rather than doubted are the ones who mention the illness they had last week.
What this changes on Monday
Ask the timing questions out loud. Recent illness, dental work, vaccination and any planned procedure in the coming weeks. These have short-lived answers, so a form completed once and filed does not capture them at all.
Separate "never" from "not today". Your notes should distinguish a patient you have declined from a patient you have deferred. They are different clinical decisions with different follow-ups, and a record that blurs them reads badly later.
Ask about supplements by name, not by category. Patients who take fish oil, vitamin E or high-dose ginkgo will not describe them as medication. If bruising matters to the plan, the question has to be specific enough to be answerable.
Check what your inherited rules rest on. If you defer for a fixed interval after a particular drug, find out where the interval came from. Some of these are well founded; at least one has been substantially revised [2].
Write what you asked, not only what you found. A note recording that a category was covered and was negative is worth more, later, than a form with an empty box that could mean anything.
Why this belongs in a training decision
The history is the cheapest safety intervention available to an injector and the one least likely to appear on a course timetable, because it does not photograph well and it cannot be demonstrated on a model. A day spent on technique produces something the delegate can show. A morning spent on the consultation produces a practitioner who declines a treatment they would otherwise have performed — which looks, on the day, like less value for money.
Ask a provider how much of their programme is spent on the patient who should not be treated today. The proportion tells you what the course thinks its job is. The practitioners who avoid the most trouble are rarely the ones with the best hands; they are the ones who asked one more question before picking up the syringe.
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