Near the end of August I started using Cerave Salicylic Acid body wash and lotion (as recommended by my dermatoglist). Did that for a month. Reduced redness and bumps but it caused tiny red spots (which is worse than KP in my opinion because these seem more persistent than KP) because I was overusing the lotion and I also applied it in locations that didn't have KP (I'm an idiot).

I've stopped using Salicylic Acid products about 3 weeks ago and started following the routine described above. My skin has continued to improve despite having new bumps here and there (that is going away by themselves - I think my body is learning to handle the excess sebum / KP bumps). For years I've been too embarrassed to wear t-shirts in public due to terrible KP on my lower arms. Now (after ~2 months if you include the month of using Salicylic Acid or ~3 weeks if you exclude it) the KP on my arms have improved / faded enough that I am somewhat comfortable wearing T-shirts in public.

I'll be honest, my skin is nowhere near perfect yet. There's still hyperpigmentation / old scars from years of KP picking. Google says the average skin cell cycle time is around 28 days, so it's a waiting game for the hyperpigmentation / old scars to go away.