What it is
Dark spots are overactive melanocytes running tyrosinase, the enzyme that builds melanin. Hydroquinone 4% blocks tyrosinase directly and has decades of trial data behind it. Expect measurable fading by week 12, a clear effect by week 20, and a plateau around 6 months. It is prescription only at 4% in the US, and it runs in cycles of 3 to 4 months with breaks, not indefinitely.
Cysteamine 5% is the hydroquinone-free alternative. In a 12-week randomized comparison it matched hydroquinone 4%, cutting melasma scores 37.9% versus 33.1% with no significant difference. The tradeoffs are practical: it smells of sulfur and works as short contact, washed off after about 15 minutes. It is a cosmeceutical rather than a drug, so insurance never covers it, and realistic timing is 8 to 16 weeks.
Tranexamic acid attacks a different input: the plasmin signaling that keeps melanocytes switched on, which is why it is used for melasma that shrugs off topicals. Oral dosing in the literature is 250 mg two to three times daily for 8 to 12 weeks, with visible change from about week 8 and reported response rates up to 89%. Topical 2 to 10% versions also have randomized data behind them.
Who this is for
- Symmetric brown patches on the cheeks, forehead, or upper lip that darken with sun
- Dark marks left behind after breakouts that outlast the blemish by months
- Spots that vitamin C and niacinamide serums have not shifted after a real trial
- Pigment that faded on a previous cream, then came back when you stopped
- Deeper skin tones, where post-blemish marks tend to linger longest and dosing has to be careful
- Planning laser work and told to get pigment under control first
How the online flow works
- 1
Intake and photos
Fill out the skin questionnaire and upload clear daylight photos of the pigmented areas.
- 2
Video visit
A live video visit with Dr. Mueller covers your history, prior products, sun exposure, and which agent and strength fit your pattern.
- 3
Pharmacy
Hydroquinone and tranexamic acid go to the pharmacy you pick; cysteamine ships as a cosmeceutical with no pharmacy involved.
- 4
Follow-up and cycling
Photo follow-ups track progress at 8 to 12 weeks, and hydroquinone stops on schedule after 3 to 4 months whether or not you feel done.
Risks, stated plainly
Honest list, not fine print. Every one of these is part of the consent conversation at your video visit.
- Exogenous ochronosis: a paradoxical blue-black darkening tied in a systematic review mainly to hydroquinone above 4% used for years, about 5 years on average. Prescribed 4% in 3 to 4 month cycles sits far from that exposure, which is exactly why the cycles are enforced.
- Cycling is not optional: unsupervised, open-ended hydroquinone use is where the documented harm lives, so the plan builds in the off periods and switches you to a non-hydroquinone agent between cycles.
- Irritation: redness, stinging, and dryness with hydroquinone; transient burning and a sulfur smell with cysteamine.
- Oral tranexamic acid is off the table with any history of blood clots, a clotting disorder, or elevated thrombosis risk; stomach upset and menstrual changes are the common side effects.
- Rebound: UV light restarts the pigment pathway, so without daily sunscreen no agent here holds its result.
The evidence
- Randomized 12-week melasma trial, cysteamine 5% versus hydroquinone 4%: MASI reduction 37.9% versus 33.1%, no significant difference.
- Network meta-analysis of oral tranexamic acid dosing in melasma (IJDVL): 250 mg three times daily for 12 weeks was the optimal regimen, with reported response rates up to 89%.
- Multicenter propensity-matched EHR cohort, 2025 (JAAD International): no association between melasma-dose oral tranexamic acid and thromboembolism.
- Systematic review of exogenous ochronosis with hydroquinone: cases associated mainly with concentrations above 4% used for years, average about 5 years.
Straight answers
- Which of the three will I be prescribed?
- That is decided on the video visit, not by an algorithm. Head to head, cysteamine 5% and hydroquinone 4% performed equivalently over 12 weeks, so the choice turns on your history, skin tone, tolerance for the sulfur smell, and whether the pattern suggests adding oral tranexamic acid.
- Why does hydroquinone have to stop after a few months?
- Long unsupervised use, mostly at strengths above 4%, is linked to exogenous ochronosis, a blue-black darkening that is hard to reverse. Cycling 3 to 4 months on with breaks keeps you in the range where trials show benefit and the documented risk is very low.
- Is oral tranexamic acid safe to take?
- A 2025 multicenter matched cohort found no association between melasma-dose tranexamic acid and blood clots. It is still not prescribed if you have had a clot, have a clotting disorder, or carry high thrombosis risk. Common side effects are stomach upset and menstrual changes.
- What does it cost?
- The prescription visit is $79 and each follow-up is $39, itemized on the pricing page; nothing is added at checkout. The medication is a separate pharmacy cost, and the generics are cheap with a discount card; exact figures are in the facts above.
- Will the spots come back?
- They can. UV light restarts the pathway these agents suppress, so daily sunscreen is part of the prescription, and maintenance between hydroquinone cycles usually leans on azelaic acid or cysteamine, which do not carry the ochronosis clock.
- Can I be on this while getting laser treatments?
- Often yes, and the sequencing matters, so bring it up on the visit. Any laser or RF session requires its own in-person exam first; the creams can start from the online visit alone.