Polynucleotides Side Effects and Aftercare: Recovery, Downtime, and What to Expect

Clinical guidance from Dr Nyla Raja MBChB (Hons), MRCGP (Dist), DFFP, DPDermatology - GMC No. 6057913

Downtime after polynucleotide treatment is often limited, but temporary redness, small raised injection-site marks, swelling, tenderness, and occasional bruising can occur. These effects should begin to settle rather than become increasingly painful, red, or swollen.

At Dr Nyla Medispa, polynucleotides are offered as a non-surgical treatment intended to support skin quality, hydration, firmness, and natural-looking improvement. As with any injectable treatment, recovery varies according to the area treated, injection technique, individual skin response, and whether bruising occurs.

What does polynucleotide recovery look like?

Polynucleotides are administered through a series of small injections into the skin. It is therefore normal to see temporary evidence of treatment immediately afterwards, particularly in delicate areas such as around the eyes.

Many patients can return to normal daily activities on the same day. However, if you have an important social occasion, photographs, or an event planned, allowing a few days is sensible in case swelling or bruising is more visible than expected.

Common polynucleotide side effects

The most commonly reported effects are related to the injection process itself rather than a dramatic reaction to the product. They are typically local and temporary.

• Redness: small areas of redness around each injection point are common immediately after treatment.
• Swelling: this can be more noticeable in areas where the skin is thin, including the under-eye area.
• Tenderness: injection points may feel mildly sore for a short time.
• Small bumps or raised marks: these can occur where product has been placed superficially and often settle as early swelling reduces.
• Bruising: this is possible with any injectable treatment and may remain visible for several days.

A systematic review of polynucleotides in aesthetic medicine found that reported side effects were generally mild and transient. It also noted that the evidence base remains relatively small and that further high-quality research is needed. Individual assessment, realistic expectations, and appropriate follow-up therefore remain important.

Polynucleotides aftercare: the first 24 hours

The aim of early aftercare is straightforward: protect fresh injection sites from unnecessary pressure, irritation, heat, and contamination while they settle.

Keep the treated skin clean and hands off

Avoid rubbing, massaging, picking, or pressing the treated area unless your practitioner has specifically advised otherwise. Do not try to flatten small raised injection-site areas yourself.

It is also sensible to avoid applying make-up directly over fresh injection points until they have settled. Use only the skincare products advised by your practitioner, and pause potentially irritating active products, exfoliants, or facial devices until the skin is comfortable again.

Avoid heat, pressure, and strenuous exercise

For the first 24 hours, avoid strenuous exercise, saunas, steam rooms, hot baths, and prolonged heat exposure. These can temporarily increase flushing and swelling. Avoid facial massage and other elective facial treatments until the area has settled and your practitioner confirms that it is appropriate to proceed.

If there is minor swelling or tenderness, a cool compress may be comfortable. Use it gently, with a clean barrier between the skin and the compress, and do not apply firm pressure to injection sites.

What should you avoid after polynucleotides?

There is usually no need for prolonged downtime, but it is sensible to postpone anything likely to irritate the skin during the early recovery period. This includes unnecessary touching, heat exposure, vigorous exercise, facial massage, and further aesthetic procedures in the same area.

Do not stop prescribed medicines, including blood-thinning medication, to try to reduce bruising unless the clinician who prescribed them has advised you to do so. If you have questions about a medicine, supplement, or an unexpected reaction, contact your treating practitioner for individual advice.

When should you contact the clinic?

Temporary redness, mild swelling, tenderness, and bruising should progressively improve. Please contact the clinic promptly if you develop symptoms that are worsening rather than settling, including:

• increasing or significant pain;
• rapidly increasing swelling, particularly if it is markedly uneven;
• spreading redness, warmth, discharge, or fever;
• persistent, painful, or unusual lumps;
• skin that becomes pale, mottled, grey, dusky, or unusually cool; or
• any change that concerns you or does not resemble the recovery information discussed at your appointment.

Severe acute symptoms, such as sudden visual disturbance, breathing difficulty, collapse, or neurological symptoms, require emergency medical attention. Cosmetic-treatment standards published by the General Medical Council emphasise that patients should be given clear information about side effects, complications, and how to report concerns after treatment.

Polynucleotides and under-eye swelling

The under-eye area has thin skin and can be prone to visible swelling after injections. A degree of temporary puffiness can therefore occur, but it should settle over time rather than become increasingly uncomfortable or pronounced.

Polynucleotides are not intended to create volume in the same way as dermal filler. They may be considered where the goal is to improve the quality of delicate skin, although suitability for the under-eye area should always be assessed in person. If hydration is the main concern, it may also be helpful to understand the differences between polynucleotides and Profhilo, as the treatments work in different ways.

The key point

Polynucleotide recovery is often straightforward: expect some short-lived redness, swelling, tenderness, small injection marks, or bruising, and avoid unnecessary heat, pressure, and irritation during the first day. The important distinction is whether symptoms are improving. If pain, swelling, redness, or skin changes are becoming more pronounced rather than settling, contact your treating clinic promptly for advice.