12. How much this usually costs
This is one reason I like this approach: it doesn’t need to be expensive. A bottle of lactic acid body lotion usually falls somewhere around $12 to $30, depending on the brand and size. A tub of petroleum jelly or a basic healing ointment may cost $4 to $15 and can last months.
That means you can often build an effective knee-care routine for under $20 to $35 total. Compared with buying multiple scrubs, “brightening” soaps, and trendy peel pads, it’s a more focused way to spend your money. I always prefer one reliable active plus one reliable moisturizer over six half-used jars cluttering a bathroom shelf.
13. Who should patch test first
If you have eczema, very sensitive skin, a history of contact dermatitis, or deeper cracks in the skin, patch test before applying anything all over the kneecaps. Put a small amount of the lactic acid product on a 1-inch area once daily for 3 days. If you get persistent burning, swelling, or a rash, don’t keep pushing through.
You should also avoid applying acids to freshly shaved, broken, or actively inflamed skin. If your knees are split or raw, focus on healing the barrier first with a bland ointment and fragrance-free cream for several days before trying any exfoliating treatment.
14. The maintenance routine once your knees improve
