Lemon juice and egg white have natural effects on blemishes and darkened patches of skin. You can usually find exfoliants containing these two ingredients, and they should be able to keep you skin looking young and fresh.
It seems you know quite a bit about natural solutions considering you've already tried out the unlikely combo of turmeric powder, honey and redwood.. So I'd say keep going down a similar route rather than putting more chemicals and corrosive material on your skin (which is what a lot of these "miracle remedies" consist of).
Also be careful of this brand Melacare. One must only do a search on Google Images to see some horrendous and shocking side-effects that this ointment has created.