Little Platty Injured :(

I have 2 plattys and 2 silver mollys. One of the plattys is quite small in comparison to the other. I have just noticed that my smaller platty was laying at the bottom of the tank. I could see from the reflection that it looked as if he'd been bitten. It is a small area on his side thats white, with a bit of red around it. I have got him out just incase. Please help. I don't know what it is. Ive also just seen babies in the tank. Could that be the problem?? Ive attached a picture.

it looks like fungus to me, you can treat this ,
or if it looks worse for you than this pic maybe consider putting it to sleep.

[Thanks for that but it died this afternoon

Sorry for your loss. The redness around the edges leads me to believe it's not fungus but an injury. I know the fish has already died, but is it possible an ornament or rock may have fallen onto the fish? I had a fish dig in between the sand and have one of the rocks slide onto her, leaving a similar looking wound. It may be worth rearranging your decorations to remove future mishaps.

Sorry that you lost the fish, but do a water change just incase it's a ammonia or nitrite problem.

With out a better pix we'll never know propley, but it could be an ulcer, and this could be caused by a ammonia or nitrite problem. Then if it was that it could affect your other fish.

Do u test your water or do water changes?