Informed consent for cosmetic treatment, and what makes it valid

Consent is the legal and ethical basis on which anyone is permitted to do anything to your body. Without it, a procedure is not a treatment. Cosmetic medicine is unusual because the commercial pressure to obtain a yes runs in the opposite direction to the clinical duty to make sure the yes is real.

This piece sets out the three elements consent has to have, and then what happens to each of them inside a typical cosmetic sales process.

The three elements

Consent is valid when three things are true at once. The person has capacity to make this particular decision at this particular time. The person has been given adequate information. And the person is acting voluntarily, free from coercion or undue influence. Remove any one of the three and what you have is a signature rather than a consent.

Capacity, and why it is decision specific

Capacity is presumed in adults. It is assessed in relation to the specific decision, and it is about the ability to understand, retain, weigh and communicate a decision, not about whether the decision seems sensible to somebody else. A person can have capacity to consent to one thing and lack it for another, and capacity can fluctuate.

Two situations matter here. The first is sedation or intoxication: consent should not be taken from someone who has already been given a sedative, and a treatment offered at a social event where alcohol is served is a genuinely poor setting for a decision of this kind. The second is under 18s. For botulinum toxin and dermal fillers given for cosmetic purposes in England, the position is not a matter of judgement at all: the Botulinum Toxin and Cosmetic Fillers (Children) Act 2021 made it an offence to administer them to under 18s for cosmetic purposes, subject to narrow exceptions. We cover the detail and its geographical scope in our guide to that Act.

Information, and the Montgomery standard

Since the Supreme Court's judgment in Montgomery v Lanarkshire Health Board, the question of what has to be disclosed is answered from the patient's side. A clinician must take reasonable care to ensure the patient is aware of any material risks in the proposed treatment and of reasonable alternatives. A risk is material if a reasonable person in the patient's position would be likely to attach significance to it, or if the clinician is or should reasonably be aware that this patient would.

That is a patient centred test, and it does real work in cosmetic cases, because materiality here is unusually personal. A small risk of prolonged asymmetry means something different to a person whose face is their livelihood. A risk of a visible lump means something different before a wedding. The standard requires the conversation to reach those specifics rather than recite a list.

The information also has to include alternatives, and doing nothing is an alternative. A consultation that presents a single product as the answer, without discussing what else exists or what happens if you leave it, has not met the information requirement even if every risk was read aloud.

Voluntariness, and where cosmetic practice fails

Voluntariness is the element that commercial pressure attacks, and it is the one patients are least likely to think about, because pressure rarely announces itself. It looks like helpfulness.

The recurring devices are familiar. A price that is only available today. A deposit taken before the discussion is finished. A finance agreement offered and signed inside the appointment. A package of sessions bought up front so that walking away later means losing money. Treatment offered at an event, a party or a promotional evening. Each of these narrows the space in which you could reasonably say no, and that narrowing is the point of them.

What the form is actually for

A consent form is a record. Its evidential value depends entirely on whether it reflects a real discussion. A form that lists twenty risks in six point type, handed over in the treatment room, signed while the practitioner waits, records almost nothing about whether you understood or agreed to any of them.

Good practice looks different. Written information is given in advance. The discussion happens with the treating practitioner. The form is completed after that discussion and after time to reflect. Notes record what was specifically discussed with this patient, including the risks that were flagged as significant to them. If you ever need to complain or bring a claim, those notes matter far more than the signature.

You can withdraw consent

Consent is not a one way door. It can be withdrawn at any point up to and during a procedure, and a practitioner must stop when it is. Withdrawing consent after paying is a financial question, and possibly a contractual dispute, but it is not a bar to withdrawing. Nobody may continue on the basis that you have already paid.

This is worth saying plainly because the fear of causing a scene is a real and effective restraint. You do not need to justify the decision. Stop is sufficient.

Ask for your records

You have a right of access to your personal data, including clinical records, under UK data protection law. A subject access request to the clinic should produce the consultation notes, the consent form, the treatment record and, where relevant, the prescription and the batch details of the product used. Clinics are generally required to respond within one month.

Requesting your records is not an accusation. It is the simplest way to find out what was written down about a discussion you remember differently, and it is the first step in almost every complaint that goes anywhere. If a clinic reacts to a records request as though it were hostile, note that reaction too.

The practical version

You have consented properly when you could describe, in your own words and without the leaflet, what is being done, what could go wrong, what else you could do instead, what it costs to fix, and who you would call at two in the morning. If you cannot do that, the process is incomplete regardless of what you signed.