Board Thread:Game Help/@comment-32220372-20170727144941/@comment-26440657-20170801170735

Maybe your hallow spawned in a snow biome so it's hard to see, or a jungle or something, you need to check your world thoroughly. By the way, did you mean you play on PC when you got that problem? You mentioned that you have found hallow on mobile, but that doesn't help much.

I doubt breaking altars will solve his problem, it's not related to it at all, it's irrelevant. Speaking of altars, breaking a lot of altars is always a bad thing, it spreads infectious blocks each time you break one. All it does is spread infection and produce ore, less ore each time you break another so it's note worth it to break a lot, maximum of 3 should be broken. I can totally skip breaking altars because I fish a lot of crates pre-hardmode and open them in hardmode.