Medically reviewed by Dr Sin Yong · Last reviewed · 11 min read
Published 7 October 2026 · Reviewed by Dr Sin Yong
Safety questions matter more than any treatment question: the warning signs of a vascular occlusion in the first hour, infection, sun and heat after lasers, exercise, flying, make-up and what changes in pregnancy and breastfeeding. These 30 brief answers link to the fuller pages, and tell you when to call.

Treatment is deferred. Fillers have not been studied in these groups, and the fluid shifts of pregnancy alter the face in any case. It is also deferred over an active infection at the site, including a cold sore.
Read the full page →Pressing or massaging the area unless advised, make-up on the entry points before they close, and strenuous exercise, saunas, alcohol and heat or pressure facials for a short period. Mention dental work, vaccinations or travel planned nearby.
Read the full page →Skin turning white, dusky or mottled near the site, and pain that is severe or worsening, can mean the blood supply is affected and need same-day assessment. Any change in vision is an emergency: go to A&E immediately.
Read the full page →Usually not. Some swelling, redness or bruising is expected and covered in the written aftercare. Swelling with blanching, mottled skin, worsening pain or any vision change is different and needs urgent assessment.
Read the full page →Contact the clinic that treated you the same day, or another doctor if it is closed; do not wait for a routine review. Any change in vision means the nearest emergency department immediately.
Read the full page →Keep the area clean and moisturised, apply any prescribed ointment, protect it from the sun and do not pick. Scabs should be allowed to fall off on their own.
Read the full page →Direct sun, because ultraviolet drives new pigment in freshly treated skin; broad-spectrum protection is used daily regardless of weather. Aggressive exfoliation and high-strength actives are set aside until the skin settles.
Read the full page →Yes. One degree from the equator, ultraviolet varies little across the year and is frequently very high. Cloud softens visible light more than UV, and UVA passes through glass, so overcast and indoor days still count.
Read the full page →Through the day, and especially after sweating, swimming or towelling, which in Singapore's climate describes most days. A single morning application thins and breaks down with wear.
Read the full page →Elective laser treatment is generally deferred. Melasma in pregnancy is often hormonal and frequently settles after delivery, so treating it then is less predictable and unnecessary. Tell the doctor if you are pregnant, planning pregnancy or breastfeeding.
Read the full page →A bruise is blue or purple where the needle went in, tender but not disproportionately painful, and the skin over it refills when pressed. An occlusion blanches white or mottles along an artery's territory, hurts more than it should and worsens over hours. Treat white or mottled skin as the urgent one.
Read the full page →Act immediately. Any vision change means the nearest emergency department or 995. For skin signs alone, contact the clinic that injected you straight away; if unreachable, consult another doctor or go to A&E. Tell them the product, areas and timing, and do not wait to find out whether it settles.
Read the full page →The nose, the glabella between the brows, the forehead and the tear trough, because arteries there connect with the circulation of the eye. No area is free of risk. Small amounts at low pressure in the planned layer, a blunt cannula where it suits, and dissolvable product where reversibility matters reduce it.
Read the full page →Very rarely, yes, when filler enters an artery connected to the eye, most often with injections around the nose, glabella and forehead. Blurring, loss of vision, double vision or eye pain after filler is an emergency: go to the nearest hospital emergency department at once, and do not drive yourself.
Read the full page →No. Hyaluronidase breaks down hyaluronic acid filler only. Radiesse, Ellansé and Sculptra do not respond to it, so a problem after those products is managed supportively with urgent referral rather than dissolved. This is why knowing exactly what was injected matters, and why those products are placed conservatively.
Read the full page →For urgent signs, go to the nearest hospital emergency department or call 995; do not wait for a message reply. Clinic messages on +65 8023 7170 are answered Monday to Friday 10am to 8pm and Saturday 11am to 3pm, and non-urgent questions come back through that line.
Read the full page →Crusts that become thick, yellow or oozing, blisters, or pain, swelling and warmth that increase instead of settling. These can point to infection or a burn and need to be looked at rather than covered with make-up. Dark marks appearing weeks later are a separate matter and are also reviewed.
Read the full page →A heavy brow or drooping eyelid should be reported so it can be assessed. Difficulty swallowing, speaking or breathing after BTX is rare and is an emergency: go to A&E. Small bruises, tenderness and a mild headache are the commonest effects and usually settle.
Read the full page →Rubbing or massaging the treated areas, lying flat for a few hours if advised, and strenuous exercise, heat such as saunas, strong sun and alcohol on the day. For the first week, facial treatments, massage and pressure over the area wait unless the doctor agrees.
Read the full page →No, it needs examination. A firm nodule appearing months or years after filler can be an inflammatory reaction such as a biofilm or granuloma, and massage or guesswork is the wrong response. Any lump that is painful, growing or changing the colour of the skin should be assessed promptly.
Read the full page →After filler, keep make-up off the entry points until they have closed. After low-energy laser toning, make-up can generally go on once the redness has calmed, but crusted spots are left alone. Covering a crust that is thick, yellow or oozing delays the review it needs.
Read the full page →Mention travel planned close to a treatment date beforehand. The early days are when swelling settles and warning signs are watched for, so being within reach of the treating clinic is worth building in, and freshly lasered skin needs sun and heat planned around. Plan the review around the trip, not the trip around treatment.
Read the full page →Botulinum toxin, fillers, biostimulators and skin boosters are deferred, and many radiofrequency, focused ultrasound and body devices are too. Breastfeeding is less strict than pregnancy and decisions depend on the product or device and your doctor's advice; where there is doubt, the default is to wait.
Read the full page →No. Tretinoin is a prescription retinoid that should not be used in pregnancy or when trying to conceive, and retinol is avoided for the same reason, because topical retinoids carry a potential risk to the pregnancy. Breastfeeding use is a doctor's decision. Azelaic acid is often considered lower risk, after asking a doctor.
Read the full page →Numbness that persists, swelling that is marked or one-sided, a welt that does not flatten, or any change in facial movement. Redness, warmth and tenderness along the treated lines, some swelling along the jaw and an occasional bruise are the expected, short-lived effects.
Read the full page →Darkening that appears weeks later, around or beyond the treated spot, is usually post-inflammatory hyperpigmentation, pigment made by inflamed skin and more likely in Fitzpatrick III to V skin. Melasma provoked by heat is another cause. Early darkening that stays on the treated spot and flakes away is different and expected.
Read the full page →Stop all energy-based treatment and aggressive skincare on the area, protect it from the sun every day, and have the pigment reassessed before anything else is done. Resist booking a stronger session: rebound pigment is inflammatory, and more energy means more inflammation. A new or changing mark is examined with a dermatoscope.
Read the full page →A known allergy to hyaluronidase, or a history of significant reactions to bee or wasp stings, raises the risk of an allergic reaction and is asked about beforehand. Elective dissolving is usually deferred in pregnancy and breastfeeding and waits until infection or inflamed skin over the area has settled.
Read the full page →Yes. Blood-thinning medicines, aspirin, fish oil and some supplements make bruising more likely after any injectable, and a bleeding disorder is assessed individually. Declare them before treatment rather than stopping anything yourself, since a prescribed blood thinner should only be changed by the doctor who prescribed it.
Read the full page →Because heat and light feed every pigment process. For melasma, heat is a trigger in its own right, so saunas, steam rooms and hot kitchens count, and aggressive treatment can make it return darker. Daily broad-spectrum sun protection, with iron oxides for visible light, runs through the whole plan.
Read the full page →Answers are brief by design and condensed from the linked pages, where the reasoning, caveats and references sit. They are general information and not a substitute for an examination; a consultation with Dr Sin Yong decides what, if anything, is advised. If something feels wrong after a treatment, read the warning signs and contact the clinic.
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