Had black,brown and purple toenail fungus for a couple months,seems to be getting better,any health concerns related to fungus?

Fungal Bruise?: A true toenail fungus, of a couple month duration, typically does not get better without intervention. Your description sounds more like a sub- ungual bruising that is going through a color change as the blood dissipates. More to the point, fungus infections not only infect the nails and skin but can also have devastating effects when infecting other organs of the body.