Patient with a history of allergy: how to lead the consultation
"I'm allergic, but only to shrimp." "I had a reaction to anesthesia once, but I don't remember it well." "I swelled up a lot once, I don't know from what." A sentence from a patient with an allergy history can be irrelevant or decisive. The professional's job is to turn a vague memory into usable clinical information, without alarming or downplaying. This page offers a script for questions, explanation and documentation.
Why ask with a method?
Because patients tend to answer only what they think is important. Someone who says "I have no allergies" may forget a reaction to the dentist's anesthetic, an itch from latex or hives with no known cause. And what seemed irrelevant may be the key to choosing a product, an anesthetic or an antiseptic. A well-taken medical history is the first level of safety and the basis of informed consent.
See also medical history form in harmonization and severe allergy and filler.
Which questions should you ask?
Ask for details on every positive answer: which substance, when, what signs (itching, redness, swelling of the lips or tongue, shortness of breath, drop in blood pressure), how long it lasted and how it was treated. The difference between "headache from a medication" (adverse effect) and "swelling of the throat" (severe reaction) is large. For the concept, see topical anesthetic allergy and lidocaine allergy in HOF.
When does the history change your approach?
Not every allergy changes the plan. What weighs is the severity, the substance involved and the closeness to the planned product.
| Situation reported | Likely impact | Suggested approach |
|---|---|---|
| Food allergy unrelated to the product | Low | Document and proceed |
| Mild reaction to a common medication | Low to moderate | Document, avoid the agent and check the composition of every item used |
| Reaction to an anesthetic | Moderate to high | Clarify the type of reaction and consider an alternative or specialist assessment |
| Reaction to a component of the planned product | High | Do not inject without assessment, consider another product or give up |
| History of anaphylaxis or angioedema | High | Allergist's assessment before any decision |
| Autoimmune disease or active chronic hives | Variable | Individual assessment and, if needed, contact with the treating physician |
The table is only a map to organize your reasoning. The decision belongs to the qualified professional, according to their council's rules.
How do you explain your approach without alarming?
A patient who hears "allergy" in the office may get scared or offended. Be direct and proportionate: what you saw, what it changes, what you will do and what they need to do. Avoid lines like "you could die from this" or, at the other extreme, "oh, that's nothing."
- Validate their account. "Thank you for telling me, it helps me choose what to use."
- Explain what changes. "I will avoid such-and-such substance" or "I need an assessment first."
- Explain what does not change. If the procedure goes ahead, say the plan is the same.
- Explain what to do if a sign appears. Which signs to watch for, for how long and how to reach you. See communicating risk to the patient.
- Document. What was reported, what was decided and what was explained.
If the patient had a complication elsewhere and comes in afraid, the scripts for patient who already had it done elsewhere and patient afraid of a serious complication complement this one.
What if the patient omits or downplays?
It happens, out of fear of being turned away. Stress that the information is there to protect the patient, not to block them. If you suspect an omission (inconsistent history, earlier signs), see patient who omits information in the medical history. When in doubt, postponing to reassess is always safer than going ahead.
When should you postpone or refer?
Consider postponing or referring if:
- The account suggests a severe reaction or one with an unclear mechanism.
- There was a previous reaction to a product similar to the planned one.
- The patient is in a hives flare or takes medication that can mask signs.
- The history is confusing and the doubt cannot be settled in the consultation.
- There is an active systemic disease that calls for the treating physician's assessment.
Postponing is not declining: it is seeking safe information. Agree on the follow-up and explain what will be assessed.
What should you document?
Write down the allergy (agent, reaction, date, treatment), the source (patient account or report), the approach you decided on and what was explained to the patient. If the patient declines the recommended test or assessment, document the refusal. This record is part of the patient record and of consent, and it helps whoever treats the patient next.
Frequently asked questions
Which allergies should I ask about in the HOF medical history?
Allergies to anesthetics, to medications in general, to latex, to antiseptics, to foods and to substances associated with the product to be used, plus previous reactions to aesthetic procedures and any tendency toward exaggerated reactions.
Does an allergy to something rule out harmonization?
It depends on what the allergy is to, how the reaction went and the planned product. The decision is clinical and individual. A severe allergy, or one to a product component, calls for caution, postponing or another option.
Can I run an allergy test beforehand?
That depends on the product and on your protocol. If the doubt is relevant, an allergist's assessment before the procedure is a prudent approach, at your discretion.
What should I tell a patient who had a reaction in a previous procedure?
Ask what happened, when, with which product and what was done. Say you will take it into account, explain your approach and document it. Do not downplay it or dramatize it.
Harmy images are illustrative simulations generated by AI from the patient's photo to support the conversation between practitioner and patient. They are not a promise of results. Indication, technique, product and volume are solely the decision of the licensed practitioner. This content is for information only and does not replace a clinical assessment.