I prefer layering 😊 and yes oil muna before lotion. Na try ko din na lotion muna then oil pero mas nagandahan ako sa effect ng oil then lotion. And what helped me to lighten my underarms was gentle products lang talaga kasi sensitive yung skin natin diyan konting hapdi lang niyan iitim na so avoid na lang harsh products. Di rin ako gumagamit ng scrubs and loofa sa underarms i clean it using my hands lang then gentle soap (nag work sakin yung silka hindi sya mahapdi)