5% AHA + 1% BHA: How Higher Concentrations Work

TL;DR: A higher acid concentration means more exfoliating action per use, a stronger tool for stubborn KP that also raises the risk of irritation, so it suits skin already used to actives.

What concentration actually means

When a body wash lists 5% AHA and 1% BHA, those percentages describe how much active acid the formula contains. A higher concentration generally means more exfoliating action available per use compared with a lower-strength formula using the same acids. It does not mean a different kind of result, it means a stronger version of the same effect, which is why it is positioned for stubborn cases rather than everyday maintenance. With that strength comes a higher chance of irritation, the trade-off at the heart of stepping up.

How it works on body skin

This formula combines two acid families that work in different places. The 5% AHA portion, glycolic and lactic acid, is water-soluble and acts on the skin surface, dissolving the bonds that hold dead cells together so rough texture sheds more evenly. The 1% BHA, salicylic acid, is oil-soluble, letting it travel into the follicle where keratin plugs form, which is exactly where KP bumps originate. Body skin on arms, thighs and the back is thicker than facial skin, so a higher-strength pairing gives surface-level and follicle-level exfoliation enough to make headway on stubborn texture. In a wash-off cleanser, the acids act during contact time and rinse away.

What to expect

Weeks 1–2: Skin meets a stronger dose than it may be used to. Mild tingling and some dryness can be normal. Because a higher concentration carries more irritation risk, keep use infrequent at first.

Weeks 3–4: As turnover steadies, texture often begins to smooth and bumps feel less pronounced. Comfortable skin can handle slightly more frequent use.

Weeks 4–6: A realistic window to assess results. Outcomes vary, and KP is managed rather than cured, so consistency keeps the benefit; stopping tends to let texture gradually return.

How to use it correctly

Higher strength rewards a measured approach. Start at 3–4 times a week rather than daily. Apply to damp skin in the shower, lather over the affected areas, and leave the lather on for 60–90 seconds of contact time before rinsing thoroughly, the acids, not friction, do the work. Wear SPF daily, since acids increase sun sensitivity and this concentration makes that more relevant. Always patch-test before wider use, and only step up to 5% AHA + 1% BHA from a gentler acid you already tolerate. Experienced skin can build toward daily use once it has shown it can handle the strength.

Who should use it

A higher concentration is the right tool when a lower-strength acid has plateaued and KP or body breakouts remain stubborn. It is not for first-timers, and not for sensitive, broken, irritated or sunburned skin, where the added strength is more likely to cause harm than help. If you are new to acids, a gentler everyday formula is the correct starting concentration.

The TLC Pick

Our 5% AHA 1% BHA Body Wash – KP Treatment is a 200 ml high-strength cleanser delivering 5% AHA (glycolic + lactic) and 1% salicylic acid, a deliberate step up from our everyday AHA BHA Body Wash for skin ready for a stronger concentration. Use 3–4 times a week to start, with SPF and a patch test.