Tretinoin (Tretinoin) is a potent topical retinoid derived from Vitamin A, used primarily for the treatment of acne vulgaris and the management of photoaged skin. It works by accelerating cellular turnover and modulating the process of keratinisation. By preventing the formation of microcomedones (clogged pores) and promoting the shedding of dead skin cells, it helps clear existing acne and prevents new breakouts. Additionally, it is used to improve skin texture and reduce the appearance of fine wrinkles and hyperpigmentation. It is available in various topical strengths and formulations, including creams and gels.

Tretinoin (Tretinoin) is a topical retinoid, a biologically active derivative of vitamin A (all-trans retinoic acid), widely used in dermatology for the treatment of acne vulgaris and photoaged skin. It is a prescription medicine intended for external use and should be used under medical supervision due to its potency and potential for skin irritation.

Tretinoin works by binding to nuclear retinoic acid receptors (RARs), which regulate gene expression involved in skin cell growth, differentiation, and turnover. Through this action, it normalises the process of keratinisation in the follicular epithelium, reducing the abnormal buildup of dead skin cells and sebum that leads to comedone (blackhead and whitehead) formation. This helps prevent new acne lesions and supports the resolution of existing ones.

By increasing epidermal cell turnover and promoting shedding of cornified cells, Tretinoin helps keep pores clear and reduces microcomedone formation, which is the earliest stage of acne development. It also has effects on dermal remodelling, including stimulation of collagen production and reduction of collagen breakdown, which contributes to gradual improvement in skin texture and signs of photoaging such as fine lines and uneven pigmentation.

With dermatologist-supervised use over time, Tretinoin may improve overall skin quality, including smoother texture and more even tone. However, results develop gradually over weeks to months, and early use commonly causes temporary irritation such as redness, dryness, peeling, or sensitivity as the skin adapts to increased cell turnover.

Because of its strong biological activity, Tretinoin is typically started at a low strength and frequency and adjusted based on tolerance. It is a long-term therapeutic agent used as part of a structured dermatological treatment plan rather than a quick-acting cosmetic product.

Tretinoin may be indicated by your doctor for:

Acne Vulgaris

To treat blackheads, whiteheads, and inflammatory acne lesions.

Photoaging

To reduce the appearance of fine wrinkles, skin roughness, and "liver spots" (lentigines) caused by sun damage.

Hyperpigmentation

To help lighten dark patches of skin and even out skin tone.

Follicular Disorders

To manage conditions characterised by abnormal skin cell buildup, such as keratosis pilaris.

Tretinoin may provide benefits such as:

• Helps treat acne by increasing skin cell turnover and preventing pore blockage.

• Helps reduce the formation of new comedones (blackheads and whiteheads).

• Helps clear existing acne lesions by promoting faster shedding of dead skin cells.

• May reduce the frequency and severity of acne breakouts with consistent use.

• May improve skin texture by normalising follicular keratinisation.

• May help improve the appearance of fine lines associated with photoaged skin.

• May help reduce uneven skin tone and post-acne pigmentation over time.

• Supports overall skin renewal by increasing epidermal cell turnover.

Tretinoin is a potent medication, and localised skin reactions are common, particularly during the initial phase of treatment.

Common side effects may include

• Skin redness (erythema)

• Peeling or flaking of the treated area

• Sensation of warmth or mild stinging

• Increased sensitivity to sunlight

• Temporary dryness

Less common side effects may include

• Temporary hyperpigmentation or hypopigmentation (changes in skin colour)

• Swelling or blistering (if applied excessively)

• Intense skin irritation

Serious side effects (uncommon) may include

• Severe allergic reactions, such as hives, intense itching, or swelling of the face and throat.

• Chemical-like burns if used on sensitive or compromised skin.

• Always consult your doctor if skin irritation becomes severe or if you notice symptoms of an allergic reaction.

Use Tretinoin exactly as prescribed by your doctor.

• Preparation: Wash your skin with a mild, non-medicated cleanser and pat dry. Wait 20 to 30 minutes until the skin is completely dry before application to minimise irritation.

• Application: Apply a small, pea-sized amount to the entire affected area (e.g., the whole face), avoiding the eyes, nostrils, and lips.

• Frequency: Usually applied once daily in the evening. Your doctor may suggest starting every second or third night to allow the skin to adjust.

• Technique: Spread the medication thinly; using more than the recommended amount will not speed up results but will increase the risk of irritation.

• Sun Protection: Always use a broad-spectrum sunscreen during the day, as Tretinoin makes the skin significantly more prone to sunburn.

• Wash Hands: Thoroughly wash your hands after application.

Tretinoin (Tretinoin) works by interacting with retinoic acid receptors (RAR) in the nucleus of skin cells. This interaction modulates the transcription of genes involved in cell growth and differentiation. It decreases the "stickiness" of the cells in the follicular lining, preventing them from clumping together and forming a plug (comedo). Additionally, it increases the mitotic activity of follicular epithelial cells, which pushes out existing debris. In the deeper layers of the skin, it inhibits the enzymes that break down collagen while simultaneously promoting new collagen synthesis, which helps improve the structural integrity of the skin

• Be patient; acne may appear to get slightly worse during the first few weeks (purging) before it begins to improve.

• “Less is more.” A pea-sized amount is enough for the entire face; using more may increase irritation without improving results.

• If your skin becomes excessively dry or sore, your doctor may suggest applying a moisturiser before or after the Tretinoin.

• Avoid using other irritating skin products, such as those containing high concentrations of alcohol, astringents, or exfoliating acids (like Salicylic Acid), unless directed by your doctor.

• Do not apply to sunburnt skin or open wounds.

• Store at room temperature in a cool, dry place.

• Keep the tube tightly closed when not in use.

• Protect from light and heat (retinoids are light-sensitive).

• Keep out of the reach of children and pets.

• General Diet (NO INTERACTION): There are no known interactions between specific foods and topical Tretinoin. However, avoid excessive intake of Vitamin A supplements unless advised by a doctor.

• Benzoyl Peroxide (CAUTION): If used together, they may cause excessive dryness. Some formulations of Tretinoin can be deactivated by Benzoyl Peroxide; use them at different times of the day (e.g., one in the morning and one at night).

• Photosensitising Medications (MODERATE): Using Tretinoin with other drugs that increase sun sensitivity (such as certain antibiotics or diuretics) can further increase the risk of severe sunburn.

• Eczema/Rosacea (CAUTION): Patients with highly reactive skin conditions may experience severe irritation; Tretinoin should be used with extreme caution and under close medical supervision.

• Sunburn (SEVERE): Do not use on skin that is currently sunburnt; wait until the skin has fully recovered.

Using more than the recommended amount of Tretinoin (Tretinoin) on the skin is unlikely to cause serious harm, but it can increase skin irritation. This may lead to redness, dryness, peeling, burning, or increased sensitivity.

If excessive irritation occurs, the medication should be stopped temporarily until symptoms improve. If accidental ingestion or severe reaction is suspected, seek prompt medical advice.

If you miss an application, skip the missed dose and continue with your regular schedule the following evening. Do not apply a double amount to make up for a missed dose.