Red blotches on my fish

[jldurfe]

I noticed this morning that one of my yellow guppies have red blotches on their body. This evening i noticed another female guppy has them around her top fun. What is this? And what do i do to fix it? My pictures are pretty bad but i think they are enough to get the idea . Some of them my other fish are in the way

 

[GNarnian]

Looks like it might be ammonia posioning.

What are your water parameters?