I have 5 hens and one rooster.the rooster looks like he has a raw spot above his leg.under his wing.one of my hens looks like she has nasty but.i have notice they have some very loose bowel movements.they are about 4 months old,i gave them a whole watermelon this week and lots of tomatoes from garden.did I cause this to happen.or is this the beginning of a sickness.they get plenty of fresh water and laying crumbles.THEY DID NOT LOOK THAT WAY THIS MORNING.I NEED HELP.DO I NEED TO GIVE THEM MEDICINE.IF YES WHAT KIND?