Tretinoin Explained: Why It Is the Gold Standard in Skincare

If you have tried retinol serums and felt the results were slow or underwhelming, the reason is usually simple. Retinol has to be converted by your skin before it does anything. Tretinoin does not. It is the active form of vitamin A, which is why it has been the benchmark for topical skincare since it was first approved in 1971.

What is tretinoin?

Tretinoin, also called all-trans retinoic acid, is a prescription-only retinoid. Over-the-counter products contain retinol or retinol esters, which the skin has to convert in two or three steps before they become retinoic acid. A lot of the ingredient is lost along the way. Tretinoin is already retinoic acid, so it goes to work as soon as it is absorbed. That is the whole difference, and it is why tretinoin is prescribed by doctors rather than sold on the high street.

How does tretinoin work?

Tretinoin binds to receptors in the skin cells and changes how they behave. It speeds up cell turnover in the epidermis, so dull and damaged surface cells are shed more quickly and replaced with fresh ones. Deeper down it stimulates fibroblasts to produce more collagen and slows the enzymes that break existing collagen down. It also regulates how pigment is produced and distributed, which is why it helps with uneven tone, and it improves the function of the skin barrier over time once the skin has adjusted.

What can tretinoin treat?

Tretinoin was originally licensed for acne, and it remains one of the most effective treatments for it. It keeps pores clear by preventing the build-up of dead cells that blocks them, calms inflammation and reduces the formation of new spots.

Its reputation as the gold standard comes from what it does for ageing and sun-damaged skin. Long-term studies consistently show softening of fine lines, improved texture and firmness, and thicker, more elastic skin with sustained use. These are structural changes in the skin rather than a temporary plumping effect.

It is also one of the most reliable options for pigmentation. Sun spots, post-acne marks and melasma all respond to tretinoin, particularly when it is combined with strict sun protection and, where appropriate, other prescribed lightening agents.

Who is tretinoin suitable for?

Most adults benefit from tretinoin, whether the concern is acne, early lines, sun damage, uneven tone or simply keeping the skin in good condition for the long term. It is not suitable during pregnancy or breastfeeding, and it should be avoided by anyone with a known allergy to vitamin A derivatives. Some inflammatory skin conditions and very reactive skin need a different approach. Suitability is determined at your consultation, where we look at your skin, your history and what you are already using before prescribing.

How to use tretinoin

Tretinoin rewards patience. The most common mistake is using too much, too often, too soon.

Apply it in the evening to clean, completely dry skin. Waiting twenty minutes after washing reduces irritation. A pea-sized amount is enough for the whole face. Start two or three nights a week and build up frequency over several weeks as your skin tolerates it. Keep the rest of your routine simple while you adjust, with a gentle cleanser and a good moisturiser, and pause any exfoliating acids or scrubs.

Sunscreen every morning is not optional. Tretinoin makes the skin more sensitive to UV, and unprotected sun exposure undoes much of the benefit.

Expect an adjustment period of eight to twelve weeks. Visible improvement in texture and tone usually starts after three months, with the most significant changes in lines and pigmentation appearing over six to twelve months of consistent use.

Side effects and purging

In the first few weeks most people notice some dryness, flaking and mild redness. This is expected and settles as the skin adapts. Acne-prone skin may see a temporary increase in spots as tretinoin brings blocked pores to the surface faster. This is known as purging and it typically passes within the first six weeks.

If irritation is more than mild, the answer is almost always to reduce frequency rather than stop altogether. Buffering by applying moisturiser first, or using a lower strength for a period, also helps. If you are struggling, get in touch rather than pushing through.

Tretinoin at Karwal Aesthetics

We prescribe tretinoin as part of a doctor-led skin plan rather than as a standalone product. Dr Karwal assesses your skin, your goals and your current routine, prescribes the appropriate strength and sets out how to build it in. We review progress and adjust the plan as your skin responds.

Tretinoin also works well alongside in-clinic treatments. It is often used to prepare the skin before CO2 laser resurfacing and to maintain results afterwards, and it complements skin boosters such as Profhilo and polynucleotides by improving the quality of the skin they are working in.

Is tretinoin worth it?

For most skin concerns that a cream can realistically address, tretinoin is the most evidence-backed option available. It takes a few months of consistency and a sensible introduction, but the results are cumulative and they last for as long as you keep using it.

To find out whether tretinoin is right for your skin, book a consultation with Dr Karwal at our clinic in Mayfair, London. Appointments can be booked online here.