01Common vs rare — how to read aesthetic-treatment risk
Every aesthetic treatment, however non-invasive, has a risk profile. Patients who are told 'no side effects' have been sold marketing copy, not medical advice.
The right framing is two-tier: common-and-temporary effects you should expect and plan around, and rare-but-serious complications you should know how to recognise.
Common effects are pharmacologically expected. They happen to most patients to some degree, are self-limiting, and resolve without intervention.
Bruising at injection sites, mild swelling lasting 24–72 hours, brief tenderness, transient pinpoint redness — these are not 'side effects' in the medical-incident sense; they are normal tissue responses to a needle, an energy device, or a dilute neurotoxin.
Rare-but-serious complications are the events that warrant a 24/7 phone line and a clinic equipped to manage them. The published rates from large registries (US FDA AERS, Korean MFDS, manufacturer post-marketing surveillance) cluster well below 0.1% across the major treatment categories — but rare is not zero, and the clinic you choose should be honest about which events they have actually managed and how.
02Per-treatment table — what is common, what is rare, and how long it lasts
The table below summarises the published profile for each major treatment category we offer at Waleerat Clinic. Common effects are listed first; rare-but-serious effects follow.
Every estimate is sourced from US FDA / EMA / Korean MFDS post-marketing data and the device manufacturer's IFU (Instructions for Use); none are clinic-internal claims.
- Botulinum toxin (Botox, Hutox): COMMON — pinpoint bruise, mild headache for 24–48h, occasional brow heaviness for 7–14d. RARE — eyelid ptosis (~1–3% transient), antibody resistance after multiple cycles, dysphagia (almost exclusively neck-area injections). Source: US FDA Botox Cosmetic prescribing information.
- HA dermal filler (Juvederm, Restylane, Belotero): COMMON — swelling 24–72h, bruising 3–7d, mild asymmetry that settles in 14d. RARE — vascular occlusion (immediate hyaluronidase reversal protocol required), Tyndall effect (blue-grey hue from superficial placement), nodules. Vascular occlusion is the single most-cited rare event in HA-filler safety literature; the clinic's hyaluronidase availability is the question to ask.
- Thread lift (PDO/PCL/PLLA): COMMON — soreness for 5–7d, micro-bruising at insertion points, mild pulling sensation while threads anchor. RARE — thread migration, palpable nodule from incomplete absorption, infection at insertion point. Thread material disclosure (PDO vs PCL vs PLLA) plus lot-number transparency is standard at reputable Bangkok clinics.
- HIFU (Ulthera, Ultraformer III): COMMON — transient redness 1–3h, mild tenderness while bone-conducted sound waves travel through SMAS layer, dot-pattern marks fade within 24h. RARE — temporary nerve dysesthesia (tingling resolves in 4–8 weeks), focal fat loss in already-thin patients (operator-dependent — depth + density settings matter more than device brand).
- Thermage FLX: COMMON — warmth during pulse, mild swelling overnight, slight rebound redness. RARE — burns from operator inattention to skin-temperature feedback (modern FLX has integrated cooling — risk is closer to zero on calibrated machines), transient hypopigmentation in Fitzpatrick V skin if treated at default Western settings rather than tropical-skin protocol.
- Pico / Q-switch laser: COMMON — pinpoint petechiae for 4–7d, transient erythema, mild peeling. RARE — post-inflammatory hyperpigmentation (PIH) in Fitzpatrick IV–V skin if untreated melasma is misidentified, paradoxical darkening on melasma when wrong wavelength chosen. Asian-skin protocol selection is non-negotiable.
- Biostimulators (Sculptra/PLLA, Profhilo, Belluxi/PCL, Juvelook): COMMON — palpable nodules in first 4–6 weeks during collagen-induction phase, mild oedema. RARE — granuloma (very low rate but well-documented in long-term registries), persistent nodule requiring intra-lesional steroid. Massage protocol after treatment is the single biggest risk modifier.
03Recovery timeline — from the same-day clinic exit to one month
International patients ask us this question more than any other: 'Can I go to dinner tonight?' The answer depends on the treatment, but the patterns are predictable. Plan your trip around the realistic recovery window, not the marketing brochure.
Same day (0–6 hours): Most non-surgical treatments allow normal activities within hours. Botox patients can eat dinner that evening — the only restrictions are no vigorous exercise for 24 hours and no lying flat for 4 hours.
Filler patients can eat normally but may want to avoid hot drinks for the first few hours if there is local swelling. HIFU patients leave the clinic with no visible signs other than temporary mild redness; many fly the same day.
Day 1–3: This is the bruising window. Filler bruises peak around 48–72 hours and are entirely makeup-coverable.
Thread lift soreness is highest day 2 and tapers by day 5. HIFU and Thermage typically have no visible recovery on day 1+ — patients often return for sightseeing the next morning.
Pico Laser leaves pinpoint marks that crust and fade by day 5.
Day 4–14: The 'social downtime' window for the more visible treatments closes. Thread lift patients can resume facials and full skincare by day 7, exercise by day 10, and any deep-tissue facial work by day 14.
Filler has fully settled by day 14 — this is when we book the optional 2-week review touch-up. Bruises are gone.
Day 15–30: Biostimulator results begin to show as collagen synthesis ramps up. HIFU and Thermage tightening becomes visible at 30 days and continues to improve through day 90.
This is the window when patients message us with 'is this normal?' photos — almost always the answer is yes, the result is still building.
04Red flags — the symptoms that warrant an immediate phone call
Most post-treatment messages we receive describe normal recovery. But there is a short list of symptoms that should trigger an immediate phone call regardless of how many days have passed since treatment.
Save your clinic's emergency number before you fly home.
- Sudden white or grey blanching of the skin within minutes to hours after filler injection — possible vascular compromise. Hyaluronidase reversal works within hours, not days. Call immediately.
- Vision change, eye pain, or sudden ptosis (drooping eyelid) after periorbital filler — possible retinal artery occlusion. This is the rarest but most-documented serious filler complication. Call immediately and seek the nearest hospital ophthalmology service.
- Fever above 38°C, expanding redness, or pus at any injection site after 48 hours — possible infection. Antibiotics within the first 24h of recognition are highly effective.
- Sudden numbness or weakness on one side of the face after thread lift — possible nerve compression. Most resolve in 4–8 weeks but should be assessed.
- Increasing pain at any treatment site rather than decreasing pain — pain that worsens past day 2 is the inverse of normal recovery and should be assessed.
- Difficulty swallowing or breathing after neck-area Botox — call emergency services first, then the clinic.
05Post-trip continuity — what happens after you fly home
The single biggest gap in Bangkok aesthetic medicine is what happens 14 days after you fly home with a problem. Reputable clinics structure for this rather than hope it does not happen.
At Waleerat Clinic, every international patient receives written aftercare in their language, a 24/7 telemed line connected to the operating physician, and a 14-day no-charge revision window if any reasonable touch-up is needed before you fly home. After day 14, we maintain a same-physician video consultation pathway for as long as the result lasts — typically 12–18 months for most treatments.
We can prescribe to most countries and arrange continuity-of-care letters for your home dermatologist if needed.
If you need in-person care at home, we maintain a network of physicians in Tokyo, Seoul, Singapore, Dubai, and major US/EU cities who have agreed to see our patients on referral. The list is curated based on procedure familiarity — not every dermatologist knows how to assess a thread lift or reverse a filler complication, and the wrong opinion can be more harmful than no opinion.
0610 questions every patient should ask — the safety checklist
Take this checklist to any consultation in Bangkok. The answers — or the discomfort with answering — tell you everything about the clinic's safety posture.
- What is the exact lot number and Thai FDA registration number of the product you are about to inject? (Reputable clinics show the box.)
- How many of this exact procedure has the operating physician personally performed? Numbers under ~50 are the learning curve for most injectables.
- What is your hyaluronidase-on-site protocol if I have a vascular event during HA filler injection? (The answer should be detailed, not vague.)
- Who do I call at 2 AM on day 5 if something feels wrong? (There should be a named physician and a phone number.)
- What is your written aftercare protocol in my language? (If they cannot produce one, that tells you their international experience.)
- Have you ever managed a serious adverse event from this procedure? What happened? (Honest clinics have stories. Clinics that say 'never' are either inexperienced or not honest.)
- What is the difference between your touch-up policy and your revision policy? (Touch-up = result building; revision = something we agree should be improved.)
- Can you connect me with my home country's referral physician if I need in-person care after I fly home?
- Is there any reason I should NOT have this treatment today — given my medical history, recent illnesses, or upcoming travel? (A 'no reason' answer to a thorough history is reassuring; a 'no reason' answer with no questions asked is a warning.)
- What does the published rate of complications from peer-reviewed registries say about this treatment, and how do you compare? (The answer should reference data, not opinion.)