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8. How often to do the treatmentTea
If your knees are mildly rough, 3 nights a week is often enough. If they’re thick, flaky, and noticeably uneven, you can try nightly use for 2 weeks, then taper to 3 to 5 nights weekly for maintenance. If you feel burning that lasts more than a few minutes, scale back immediately.
I usually tell friends to think in cycles: 14 days of consistent treatment, then reassess. If the knees are smoother but still dark, keep going. If they’re stinging, shiny, or irritated, take 3 to 5 nights off and switch to plain moisturizer plus ointment only until the skin calms down.
Biological Sciences
9. Ingredients that pair well with this trick
If your skin tolerates lactic acid, you can support results with ceramides, glycerin, urea, and petrolatum. Urea at 10% to 20% is especially helpful for thickened, scaly skin because it hydrates and gently softens hard buildup. On some people, a urea cream works just as well as lactic acid, and sometimes better.
Niacinamide at 2% to 5% can also be helpful in a body lotion if discoloration is a concern. It won’t work overnight, but over 6 to 12 weeks it may improve uneven tone while supporting the barrier. I’d avoid combining multiple strong acids, retinoids, and exfoliating scrubs all at once on the knees. That usually backfires.