Random sores! Please help!

[CannedMonster]

They’re possibly pecking each other.
Even if they’re not causing it a red wound like that will get pecked anyway.
Try to find some BluKote at a farm store. It will help with the desire to peck at the red wounds.
I also like to use Veterycin on wounds.
It helps them heal very well.

 

[Wyorp Rock]

Haven’t been treating, because I thought it was bad molting with the crazy temperature change and I don’t know what it is.

I would treat as suggested by Eggcessive in POST#2 of your thread.
The butt scabs are from feather picking, the ones on the back look like picking as well.

The Pine Tar will help protect the skin and hopefully deter more picking.
Evaluating what you feed may also be helpful. Some common causes of feather picking is boredom, lack of space and nutritional deficiencies. Increase your protein or if you are feeding a lot of none nutrient dense foodstuffs like scratch, cut way back on that.

 

[Eggcessive]

It is important to try to get the pine tar on them right away, or at least separate the ones pecked badly so the wounds don’t become worse. Pine tar is available in most feed stores where horse supplies are sold. It is a sticky strong smelling ointment with healing properties that chickens find bad to peck. The wounds you are seeing are on the verges of becoming open wounds that may become infected. Cannibalism is something that can become a bad habit and spread to other flock members, and may be hard to stop. Many times they will peck at the vent area, and that may become damaged or the insides can even be pulled out. Here is a very good article about pecking:
https://extension.psu.edu/poultry-cannibalism-prevention-and-treatment