Notes on fourth-generation peeling.

Aftercare is part of the protocol, not a send-off script. What belongs in writing, and why a downtime promise you have not measured does not belong at all.

LHALA JET is marketed as 3-in-1. Here is what each of its three functions actually does, in the order the manufacturer describes, and what the device’s FDA status covers.

Single-use ampoules change dosing, storage and inventory math in the treatment room. What that means, and what it does not mean, for LHALA Doctor and LHALA Secret.

How to frame a cumulative peel protocol as a course at the first appointment, without promising a session count or a result.

AHA, BHA and LHA are not interchangeable acid families. Here is the solubility and structural difference behind LHA in a professional peel.

What residual sebum and product film do to how a peel contacts skin, and why a prep cleanser’s own pH matters before the active step begins.

An application number and a granted patent number look similar and mean different things. Here is how to read the numbers behind INCUBE, QPT and H2sol.

What a skin irritation test measures, what it does not, and why a result on one format never transfers to another. Questions to ask any supplier.

Registration, listing, 510(k) clearance and PMA approval are four different things. Here is where a Class I, exempt device actually sits, and what that status does not claim.

Five documents to ask for before an imported peel reaches your treatment room, and what each one can and cannot tell you. LHALALA used as the worked example, gaps included.

The label points at a mechanism, not a marketing tier. What separates a fourth-generation peel from a traditional acid peel, and what it changes in the schedule.

Glass skin is usually read as a look. In Korean practice it names clarity, even tone and a healthy barrier at once, which rules out a whole class of shortcuts.