Foxes

Hi there, I have currently around four to five foxes in my garden, one of them I found in my old play house that is now filled with straw, I left some food out for it and it came out after a while and ate it. When it came out I noticed that it was limping, had bald patches and looked very weak. 

Do any of you know what I should do?

That was yesterday, today it was on the grass and I came out to give it some food but it got startled and left, what do I do now?

You should call your Animal Control people, or at least a vet willing to make house calls. The bald patches could be many things but if it's mange you want to get it out of the wild population before it spreads the deadly, highly contagious disease.