What Might Taking Part in an HS Clinical Trial Be Like?

Deciding whether to look into a clinical trial is a personal choice, and it helps to know what the experience can actually look like. This guide walks through a typical participant journey for a hidradenitis suppurativa (HS) study, in roughly the order things happen. Studies differ, so treat this as a map, not a rulebook. Depending on the study, participants may be asked to do some, but not all, of what is described here. Reading it commits you to nothing.

1–2. Finding a study and reading the basic information

Most journeys start with a search — through a doctor, a patient group, or a tool like our Trial Finder. A search result gives you the basics: the condition, the study’s status, where it is running, and a link to the public registry entry. Remember that appearing in a search does not mean you are eligible; it means the study is worth asking about.

3–4. Contacting the study centre and first contact

If a study interests you, the next step is usually to contact the study centre by phone or email, often using the contact details in the registry entry. This first conversation is low-stakes: you can describe your situation in general terms, ask what the study involves, and decide whether to go further. You are not committing to anything by asking.

5–6. Participant information and the informed-consent discussion

If you and the team both want to continue, you will receive a participant information sheet — a plain-language document describing the purpose, what you would do, the possible risks and benefits, and your rights. This leads to the informed-consent discussion, where the team explains the study and answers your questions, and you decide freely whether to sign. Consent is not a trap door: you can ask questions at any time afterwards and withdraw later. Bringing our questions checklist can make this conversation easier.

7–8. Screening, and learning you may not be eligible

Before enrolment there is usually a screening visit. The team checks the detailed inclusion and exclusion criteria — reviewing your history and often running tests such as blood work or a skin assessment. It is completely normal to be screened and then told you do not meet the criteria. That can be disappointing, but it is not a judgement about you; it is how studies protect participants and keep their results meaningful. Your usual care continues either way.

9–11. Baseline visits, randomisation and receiving a treatment

If you enrol, a baseline visit records your starting point — for example, counting lesions or completing questionnaires. In many trials you are then assigned to a group by randomisation (a computer, not a person, decides), and you may receive the investigational treatment, a comparison treatment or a placeboPlacebo: An inactive substance, usually identical in appearance to the real drug, used in clinical trials to control for the meaningful placebo response in Acne Inversa.PlaceboAn inactive substance, usually identical in appearance to the real drug, used in clinical trials to control for the meaningful placebo response in Acne Inversa.Read more in the glossary. In “blinded” studies you may not know which you receive, because expectations can influence how symptoms are judged. It is normal to feel uncertain about this; the team can explain the odds and the safety rules that let them find out quickly if a medical need arises.

12–15. Clinic visits, procedures, diaries and reporting side effects

Participation usually means visits on a schedule. Depending on the study, participants may be asked to have physical examinations, blood tests, or photographs of affected areas, and to keep a symptom diary or complete questionnaires rating pain, drainage or quality of life. You will also be asked to report side effects — anything you notice — so the team can track safety. None of these measurements are there to catch you out; they are how the study learns whether the treatment helps.

Medical photography of sensitive body areas can feel uncomfortable, and discussing intimate regions is a real barrier for many people with HS. You can ask who will see the images, how they are stored, whether a chaperone can be present, and whether particular staff can carry out sensitive parts of an exam. A good team expects these questions.

16–17. Time commitment, travel and everyday life

Being realistic about logistics matters as much as the medical detail. Ask how many visits there are and how long each takes, because the total can add up. Consider travel distance, parking, time away from work, and childcare. Depending on the study, travel or other expenses may be reimbursed — ask directly what is covered, as this varies a lot between studies. If the practical burden does not fit your life right now, that is a valid reason not to take part.

18–20. Your normal doctor, changing circumstances and withdrawing

Taking part does not replace your usual care. Ask how the study team will communicate with your normal treating doctor, and who to contact if your symptoms worsen. Life changes — a new job, a pregnancy, a move, a flareFlare: A period of acute worsening in a chronic condition. In Acne Inversa, a flare may be triggered by stress, hormonal changes, friction, or other factors and can manifest as new nodules, abscesses, or increased pain.FlareA period of acute worsening in a chronic condition. In Acne Inversa, a flare may be triggered by stress, hormonal changes, friction, or other factors and can manifest as new nodules, abscesses, or increased pain.Read more in the glossary — and you can discuss how these affect participation. Above all, remember that you can withdraw at any time, for any reason, without giving a justification and without it affecting your normal medical care. Telling the team lets them arrange any final safety checks.

21–23. Completing the trial, results and what comes after

If you complete the study, there may be a final visit and follow-up assessments. Afterwards the data is analysed. Increasingly, summaries of results are shared with participants and posted in public registries such as ClinicalTrials.gov or the EU Clinical Trials Information System — ask the team how and when you will be told. What happens next varies: continued access to an investigational treatment is not guaranteed and depends on the study and later regulatory decisions. Your own doctor can help you plan your ongoing care regardless of the outcome.

The emotional side is real

Beyond logistics, there is an emotional dimension: hope, uncertainty about which treatment you received, worry about a placebo, concerns about privacy, and the general weight of living with a chronic condition. These feelings are normal and worth naming with the study team or people you trust. Deciding not to take part is an equally valid outcome.

A note on personal stories

Imagine someone we’ll call a composite participant. They find a recruiting study near their city, phone the centre, and feel reassured by an unhurried first conversation. At screening they learn the criteria in detail; they are eligible, and they take a week to decide. During the study they attend regular visits, keep a short pain diary, and feel uneasy about the photographs at first — until the team explains exactly who will see them. Midway through, work gets busy and they consider stopping; the team offers to adjust the visit timing, and they continue. Whatever the result, they say the clearest benefit was feeling closely monitored and heard. This is not a promise of how any real study will go — it is a picture assembled from what participants and research organisations commonly describe.

Before you contact a centre

If you want the concepts first, read what a clinical trial is. For the bigger picture of how research shaped today’s treatments, see how clinical trials changed HS treatment. When you are ready, search for open HS studies, take the questions checklist with you, and return to the clinical trials hub any time. For a dermatologyDermatology: The medical specialty concerned with diagnosing and treating skin conditions. Acne Inversa is often managed by dermatologists, although surgery and other specialties may also be involved.DermatologyThe medical specialty concerned with diagnosing and treating skin conditions. Acne Inversa is often managed by dermatologists, although surgery and other specialties may also be involved.Read more in the glossary appointment, our 15 questions for your dermatologist may also help.