PRP for Hair: Side Effects, Pain and Who Should Avoid It

The usual side effects of PRP for hair are mild and short-lived: soreness and tenderness of the scalp, slight swelling, redness, pinpoint bleeding at the injection sites and, in some people, a headache, mostly settling within a day or two. Because the plasma comes from your own blood, a reaction to the material itself is not expected, and serious problems are rare. Most of the real risk lies in who should not have PRP at all, which is why screening comes first.

This article sets out what is normal after a session, what is not, how the discomfort is managed, and the conditions and medicines that make PRP unsuitable or mean it should wait.

What is normal after PRP

Reviews of the published trials describe the same small group of effects again and again. A 2022 review in Drug Design, Development and Therapy lists temporary pain during treatment, mild headache, slight itching and short-lived redness and swelling over the treated area, and found no documented major complications in the studies it covered. Cleveland Clinic's guide to PRP injections describes some swelling and pain at first, lasting a day or two.

Some people also feel light-headed during the blood draw, as they might at any blood test. None of these needs treatment beyond leaving the scalp alone and following the aftercare sheet.

Rare problems, and what to report

Serious complications after PRP for hair are uncommon. A 2022 evidence summary in American Family Physician found little risk of serious adverse events in the pooled trials, with the caveat that not every trial reported side effects carefully and most followed patients for months rather than years. The problems that have been described, mostly in individual case reports, include:

• Infection at an injection site: uncommon when the blood is handled sterilely, but possible with anything that breaks the skin.
• Firm lumps or nodules in the scalp, reported occasionally as an inflammatory reaction around injection sites.
• A temporary increase in shedding after a session, reported now and then.
• A shingles rash over the scalp and forehead, described in a published case report soon after scalp injections.
• Larger bruises or prolonged bleeding, more likely with a low platelet count or a blood-thinning medicine.

Contact the clinic promptly if, after a session:

• redness, heat or swelling spreads, or is getting worse rather than better after the first two days;
• pain increases instead of easing;
• you notice pus, a weeping area or a hard lump that does not go away;
• you develop a fever or feel generally unwell;
• a rash or blisters appear on the scalp or forehead.

Seek medical help the same day for swelling around the eyes with fever, a severe headache unlike your usual ones, or any change in your vision.

How much PRP hurts, and how the pain is managed

The blood draw feels like any routine blood test. The scalp injections are the uncomfortable part: each one stings briefly, and because many small injections are spread across the thinning area, the sensation builds over the ten to fifteen minutes they usually take. Most people describe it as uncomfortable rather than painful, but tolerance varies a great deal, and the front of the scalp tends to be more sensitive than the crown.

Ways of reducing the discomfort commonly include:

• a numbing cream applied beforehand;
• cooling the skin before and during the injections;
• for a larger area, a local anaesthetic injection that numbs a whole region of the scalp, often called a nerve block or ring block;
• fine needles and a steady pace, with a pause whenever you need one.

Tell the person treating you if it is more than you expected, because the pace can change. Afterwards, the scalp is usually tender for a day or so. Many anti-inflammatory painkillers act on platelets, and a 2024 review of the research on these medicines and PRP found that no agreed guidance yet exists on how long to avoid them. So ask the clinic which painkiller to use, rather than taking whatever is in the cupboard. Never stop a prescribed aspirin or blood thinner on your own to have PRP.

Who should avoid PRP, or wait

PRP depends on healthy platelets and on needles passing through the scalp, and the reasons to avoid or postpone it follow from those two facts. The 2022 Drug Design, Development and Therapy review separates reasons not to do PRP at all from reasons to wait or to weigh it more carefully. In general terms, PRP is usually not offered, or is postponed, with:

• A low platelet count, a platelet disorder or a bleeding disorder. The treatment relies on your platelets, and the risk of bleeding and bruising rises.
• Blood-thinning medicines, until they have been reviewed. People take them for good reasons, so any change involves the doctor who prescribed them.
• An active scalp infection or inflamed skin over the area to be injected, until it has been treated.
• Blood cancers and some other cancers, particularly while they are active or being treated.
• Pregnancy and breastfeeding, when PRP is usually deferred because there is little safety information.
• A recent illness or fever, significant anaemia, or a poorly controlled long-term illness, which are reasons to wait and treat the underlying problem first.
• A recent steroid injection into the scalp, or a course of steroid tablets, which the review lists among reasons to wait.

Smoking is listed among the factors to weigh as well, so mention it at the consultation. Separately, PRP is the wrong treatment, rather than an unsafe one, for scalp that has been smooth and bald for years, for scarring alopecia, and for shedding driven by low iron, thyroid disease or a recent illness. Those need a different plan, not a different preparation of PRP.

Why screening and technique matter

Most of what keeps PRP low-risk happens before the first needle. A careful history picks up bleeding problems, blood thinners, recent illness and pregnancy. A full blood count, where it is indicated, gives a platelet count, which is directly relevant to a treatment made from your own platelets. Examining the scalp rules out infection and confirms there are follicles left to treat.

Technique matters too. The blood should be drawn and prepared sterilely, with single-use needles, and the scalp cleaned before the injections. Cleveland Clinic notes a remote chance of contamination if a facility fails to keep the blood sterile while it is being prepared. It is reasonable to ask any clinic who draws, prepares and injects the plasma, and how; the questions to ask before paying for PRP lists them. GFC and other preparations made from your blood carry the same needle-related effects, and how PRP, GFC and exosomes differ covers what changes between them.

When to see a doctor

Before any course, tell the doctor at the consultation, not on the day, if you bruise easily or have a bleeding problem, take blood thinners, aspirin or regular painkillers, are pregnant or breastfeeding, or are being treated for cancer. After a session, report any of the warning signs listed above rather than waiting to see whether they settle. What to do after a PRP session covers washing, exercise and the first few days in detail.

See a doctor about the hair loss itself if it is sudden or heavy, comes in round patches, or comes with scaling, redness, pain or itching, or with symptoms such as tiredness, weight change or irregular periods. Those point to causes that PRP does not treat.

Getting it assessed

Consultations are available at our clinics in Sector 39, Gurugram and Rohini, Delhi, and are carried out by registered medical practitioners. The assessment covers your medical history and medicines, an examination of the scalp, and blood tests where your history points to them, before any session is booked. PRP hair treatment in Gurgaon and PRP hair treatment in Rohini explain how a course runs at each clinic, and how many PRP sessions hair usually needs explains how one is planned and reviewed. Whether PRP is worth doing at all is a separate question, covered in what the evidence on PRP for hair loss shows.