Problems after Microneedling: Redness, Dark Spots, Granulomas

What is normal day by day after microneedling?

Microneedling is a procedure that stimulates repair by making many tiny holes in the skin; while the skin closes these tiny wounds, some symptoms are unavoidable. In a systematic review of published studies, the most frequently reported side effects were temporary redness, swelling and pain lasting at most about 7 days after the treatment. The American Academy of Dermatology (AAD) also states that these reactions usually disappear within a few days to a week. We have described the procedure itself and the aftercare recommendations in our article “Microneedling”; here we focus only on telling the problems apart.

These periods describe an average course. The needle depth, the area treated, whether radiofrequency microneedling is used and your skin type can change them. Here too, the main yardstick is this: if the symptoms decrease as the days pass, this fits with the expected healing; if they increase or new symptoms are added, contact your physician.

Redness after microneedling is not going away: what could be the cause?

Redness lasting more than a week is not a diagnosis on its own; it can be due to several different causes. With more intensive treatments such as deep needle settings and radiofrequency microneedling, healing can take somewhat longer. Apart from this, the causes most often considered are:

• Irritation or contact dermatitis: skin care products applied during the healing period, returning too early to products containing acids or retinoids, make-up or sunscreen can irritate the skin. In the review, irritant contact dermatitis is among the frequently reported temporary side effects.
• Allergy: raised redness in which itching is the main feature and which spreads beyond the treated area suggests an allergic reaction.
• Infection: accompanied by increasing pain, warmth, discharge and crusting.
• Cold sores: painful, clustered small blisters are seen.
• Delayed reaction to a serum: the redness seems to be going away, but firm bumps appear in its place (we explain this separately below).
• An underlying skin disease: rosacea (a condition causing facial redness and visible blood vessels) or eczema can flare up after the treatment.

It is often not possible to tell these causes apart just by looking, and their treatments differ. If the redness has lasted more than a week or is increasing, show it to your physician rather than trying a new cream.

Serums applied to the skin and granulomas

It is common for a serum, a vitamin mixture or another skin care product to be applied to the skin during or immediately after microneedling. However, the U.S. Food and Drug Administration (FDA) states that microneedling devices are not approved for delivering cosmetic products, topical medicines or vitamin solutions into the skin and that the risks of this combined use are not known. A product that would normally stay only on the surface of the skin enters the skin through the holes that have been made; the product is, in effect, worked into the skin.

Granulomas are small, firm foci of inflammation that the body forms against a substance that has entered the tissue and that it cannot get rid of. Granulomas developing after microneedling have been reported rarely; however, some respond poorly to treatment. Looking at the published case reports, the following picture emerges:

• In three women reported in the USA, granulomas developed on the face after microneedling for skin rejuvenation. Two of the patients had had the same vitamin C serum applied during the treatment. Tissue samples showed granulomas developing against a foreign body, no germs could be grown, and in two patients a patch test to this serum was positive. A widespread hypersensitivity reaction in the body, not only in the skin, was also described. The first treatment started with cortisone was insufficient.
• A systematic review on the subject from 2025 brought together a total of 15 patients (aged 26–74) from 13 publications. In most cases, a motorised needle pen had been used and vitamin C had been applied to the skin. The response to treatment varied from patient to patient; in some cases the condition was resistant to treatment.
• Another case report describes a treatment-resistant granulomatous reaction after microneedling in which a mixture containing vitamin C, niacinamide and plant extracts was applied to the skin.

This information is based on case reports; how often the problem occurs is not known. There are not enough data to say that a particular type of product is safe or unsafe. The practical conclusion is this: applying products that were not made to enter the skin during microneedling carries an unknown risk. Before the treatment, you have the right to ask what will be applied to the skin and whether this product is suitable for use on open skin.

A granuloma is usually noticed days or weeks after the treatment as firm, raised, red bumps in the treated area. These bumps can resemble spots but do not empty when squeezed and do not go away. A tissue sample (biopsy) is often needed for the diagnosis; because it can be confused with infection, do not use antibiotics or cortisone creams on your own. In a patient who had had liquid silicone injected into the face twenty years earlier, a hypersensitivity reaction requiring long-term treatment was reported after microneedling carried out outside a healthcare facility; so be sure to mention any previous fillers.

Itching and rash: contact dermatitis and metal allergy

Contact dermatitis is an irritant or allergic reaction to a substance that comes into contact with the skin. Because the skin barrier is temporarily weakened after microneedling, even products that normally cause no problem can lead to stinging, burning and itching. The FDA lists stinging or itching when cosmetic products are applied among the known side effects.

The systematic review listed metal allergy among the factors that increase the risk of problems. The needles are mostly made of stainless steel; if you have a nickel allergy, mention it before the treatment. If you notice intense itching or a raised, spreading rash after the treatment, stop trying new products and contact your physician.

Is it normal to get spots after microneedling?

During the healing period, a few small spots or small white cysts called milia may appear; most are temporary, and heavy, occlusive skin care products can contribute. Data on this for microneedling are limited. If the spots are increasing in number or becoming painful and inflamed, show them to a physician, because they can be confused with infection, cold sores or granulomas; do not squeeze them. Details are in our article “Spots and Milia (White Cysts) after Laser and Peels”. Postponing microneedling while there is active, inflamed acne in the treatment area is a general rule.

Infection and cold sore flare-ups

Because microneedling creates many small openings in the skin, it can be an entry point for infection. The FDA lists infection among the less common side effects; the review also identified active infection in the treatment area as one of the main factors that increase the risk. Increasing pain, warmth, swelling, yellow crusts, discharge and fever suggest a bacterial infection. Some infections, however, can appear weeks later as bumps that do not respond to treatment. With these symptoms, the physician needs to see the area and, if necessary, take a sample; details are in our article “Infection after Aesthetic Treatments”.

The cold sore virus can be reactivated by the small trauma the procedure causes; the FDA lists this among the known side effects. Cold sore flare-ups after aesthetic procedures are considered uncommon; however, there are no reliable data on how often they occur. They usually appear in the first days as clusters of small, fluid-filled blisters or painful sores around the mouth or anywhere in the treated area. Because the needles can carry the virus to other parts of the healing skin, it is important to contact a physician the same day. If you have a history of cold sores, mention it before the treatment; your physician will decide whether preventive medicine is needed.

Single-use materials for anything that comes into contact with blood are the foundation of infection safety. The FDA states clearly that reusing the needle cartridge is not safe. The risk of transmissible diseases specific to treatments with PRP is covered in our article “Microneedling”.

Dark spots after microneedling: darkening of the skin

Post-inflammatory hyperpigmentation, that is, darkening of the skin that develops as it heals, was listed in the systematic review both among the common temporary side effects and among the serious problems that can last a long time. The review identified darker skin as one of the factors that increase the risk; the FDA also draws attention to the risk of darkening or lightening of the skin in darker skin types. On darker skin, a dark appearance for a few days immediately after the treatment is an expected reaction; what really needs attention are brown areas that appear after the redness has gone and last for weeks.

Such dark spots often fade over weeks and months; how long this takes varies from person to person. Sun darkens dark spots and makes them last longer; so strict sun protection is the basic precaution. Do not start strong lightening or acid products on your own; they can increase irritation and pigmentation on healing skin. For precautions specific to darker skin, see our article “Laser, IPL and Chemical Peels on Olive and Darker Skin”.

What are tram tracks?

Tram tracks are linear marks or small bumps lined up along the path the device has taken over the skin, resembling railway tracks. They have been reported after the use of a microneedling device in the treatment of acne scars and after radiofrequency microneedling. The systematic review listed tram tracks among the serious problems that can last a long time; the FDA also mentions the formation of lines on the face among the rare side effects. How often they occur is not known.

Tram tracks may be noticed in the first weeks as red lines or small, regularly lined-up bumps. In one reported case, this picture, which developed after radiofrequency microneedling, resolved in 6 months with a combination of several treatments; however, there is no standard treatment, and a single case cannot be generalised. Early recognition is important; so if you see regular lines, show them to your physician. If you are prone to raised scars or keloids, mention it before the treatment.

What is different after radiofrequency microneedling?

In radiofrequency microneedling, the needles also deliver heat into the skin. So in addition to the problems above, heat-related problems can occur: grid or square-patterned marks matching the shape of the tip, burns, blistering and, more rarely, loss of fatty tissue. Tram tracks have also been reported after radiofrequency microneedling. Because we describe heat-related problems and the FDA’s safety communication on these devices in detail in our article “Problems after HIFU and Radiofrequency”, we do not repeat them here.

If you have used a needle roller at home

Needle rollers and pens used at home cannot be sterilised, their needles can become blunt and bent over time, and pressing too hard increases the risk of scarring, dark spots and infection; the AAD also states that these products can spread infections such as warts and cold sores to other parts of the skin. The warning signs above also apply to treatments done at home; details are in our articles “Needle-Free Filler Pens and At-Home Treatments” and “Microneedling”.

What to do if there is a problem

1. If there is shortness of breath, swelling of the lips or tongue, or rapidly spreading redness with a high fever, call 112 without waiting.
2. If there is one of the warning signs, call the physician who performed the treatment; take a photo of the area.
3. Note the date of the treatment, whether radiofrequency microneedling was used, and the names and contents of all products applied to the skin during or after the treatment; keep their packaging if possible.
4. Stop any new products your physician has not recommended; follow only the aftercare instructions you were given.
5. Protect yourself from the sun with shade, a hat and clothing; start sunscreen when your physician recommends.
6. If you cannot reach your physician and there is fever, rapidly spreading redness or severe pain, go to an emergency department.

What should you not do?

• Do not pick off scabs or peeling skin; do not squeeze or scratch spots and bumps.
• Do not apply antibiotic, cortisone, cold sore or lightening creams without your physician’s advice; do not use medicines left over at home.
• Do not use new serums, acid products, retinoids or exfoliating mitts during the healing period; for make-up, wait for the period your physician recommends.
• Do not use home remedies such as toothpaste, lemon, vinegar, eau de cologne or plant oils.
• Do not have a new procedure on the same area before the skin has fully healed and the problem has become clear.

What can your physician do?

The physician first distinguishes whether the problem is expected healing, irritation, allergy, infection, cold sores or a granuloma developing later. For infection and cold sores, appropriate treatment can be started; if necessary, a sample is taken. For contact dermatitis, the triggering product is stopped and treatments that soothe the skin are planned; if necessary, a patch test can be done to find the substance responsible. If a granuloma is suspected, a tissue sample may be taken; treatment is planned individually and can take months.

For dark spots and tram tracks, the basic approach is sun protection and time; if necessary, the physician may recommend additional treatments. The next session is usually discussed only after the problem has completely resolved and its cause has been understood.

Questions you can ask before the treatment to reduce the risk

• What will be applied to the skin during or after the treatment? Is this product suitable for use on open skin, and are its contents known?
• Is the needle cartridge single-use, and will a new one be opened for me?
• Is the method to be used on me needles only, or radiofrequency microneedling?
• Do my history of cold sores, nickel allergy, tendency to keloids, previous fillers and the medicines I take change the plan?
• Will the treatment be postponed if there are active spots, cold sores or a rash in the treatment area?

Limits of the evidence: much of the information on microneedling complications is based on small studies, case reports and reviews that bring these together. The devices, needle depths and products applied to the skin vary greatly between studies; how often problems such as granulomas and tram tracks occur is not known. So no personal risk figure can be given to you. This content is for information only; it does not replace an examination.