Photoprotection as a Procedural Adjunct

In Fitzpatrick IV–VI, photoprotection is part of the peel, not aftercare bolted on afterward. Ultraviolet light directly stimulates melanogenesis, so freshly peeled, transiently inflamed skin meeting unprotected sun is the most reliable way to generate post-inflammatory hyperpigmentation (PIH). Because UV is also the most modifiable driver of PIH, treating photoprotection as a procedural step — engineered and enforced, not merely recommended — is one of the highest-yield safety decisions you make.

UV is the dominant modifiable PIH driver

The PIH risk equation has several terms, but they are not equally controllable. Phototype and melanocyte lability are fixed for a given patient; injury depth and inflammation you minimise through agent choice and technique. UV exposure is the term you can most directly drive toward zero — and it is the term most likely to undo an otherwise well-run peel. A patient who peels cleanly and then commutes daily on a two-wheeler under the Indian sun without protection has reintroduced the single trigger you worked hardest to avoid.

This reframes the sunscreen conversation. It is not lifestyle advice appended to the visit; it is a load-bearing part of the protocol, with the same status as priming or neutralisation.

Before and after the peel

Photoprotection brackets the procedure on both sides:

• Before. Strict sun protection during the priming weeks keeps baseline pigment quiet and avoids starting the peel on already UV-stimulated skin. A recently sun-exposed or tanned face is a reason to defer.
• After. The post-peel window — when the barrier is recovering and inflammation is highest — is when UV does the most damage. This is the period to enforce the most rigorous protection, ideally for several weeks.

The peel is not "finished" when the patient leaves the chair; it is finished when the post-peel photoprotection window has been observed.

Broad-spectrum first, then visible light

Two layers of photoprotection matter in skin of color:

Broad-spectrum UVA/UVB cover is the non-negotiable baseline — SPF 50+ with high UVA protection (PA++++), applied generously and, crucially, reapplied. The number on the tube assumes an application thickness and reapplication cadence most patients never meet, so technique and reapplication matter as much as the rating itself. A physical/mineral filter such as zinc oxide is a sensible, well-tolerated choice on sensitised post-peel skin.

Visible-light protection is the layer clinicians often miss. Melasma and some PIH are driven not only by UV but by visible light, against which clear chemical sunscreens offer little defence. Tinted sunscreens containing iron oxides add meaningful visible-light cover and are particularly relevant for melasma-prone Fitzpatrick IV–VI patients. Where visible-light-driven pigment is part of the picture, recommending a tinted/iron-oxide formulation is a deliberate clinical upgrade, not a cosmetic preference.

Adherence is the real variable

The best sunscreen is the one the patient actually uses, in enough quantity, often enough. Adherence — not the formulation — is usually the limiting factor, so engineer it:

• Prescribe specifically. Name the product, the amount (a clearly demonstrated quantity for the face), and the reapplication interval, rather than saying "use sunscreen."
• Make it a take-home step. Treating sunscreen as a dispensed part of the protocol, like any other product, raises adherence over a verbal instruction.
• Pair with behaviour. Shade, timing around peak sun, and hats reduce the dose that protection has to absorb — especially relevant for outdoor workers and commuters.
• Set the expectation up front. Patients who understand that sun exposure can undo the peel comply better than those told only "wear SPF."

Key takeaway

In skin of color, photoprotection is procedural. UV is the dominant modifiable PIH driver, so bracket the peel with strict broad-spectrum cover before and after, add iron-oxide tinted protection where visible light is driving melasma, and treat adherence as something to engineer rather than assume. The acid resurfaces the skin; photoprotection is what protects the result you just created.