Hello, firstly thank you for making this site and sharing your message and trying to help both Vets and pet owners do better by and for their sake.
The cold weather in Oregon is setting in, I attached some photos I hope help. I’m trying to figure out the best way to identify and treat this issue.
The following are my observations of the marks located at the base of the tail areas side and underside only, surface level circular with some being slightly more crater like. Hair loss and area effects remain the same after what feels like over a month already. Plasma is typical puss in 2 or so spots, no swelling since first observed till present day, skin near effected area looks okay, over grooming of the area likely but not believing this is a source of pain. We live in a farm setting he is a stray I will watch over like my own and treat as such, I’m not against funding anything from big or small for his care but he’s strictly outdoor hunter and sometimes I wont see him for days. Would be most appreciative to any insight in what this might be or how I can help, likewise if there is a wound spray or dewormer I could purchase he is 100% outdoors and I see no signs of worms but he drinks from bird bath dishes. He will allow me to handle him but only so much I’d be much more worried when his patience runs out. I’d say he weighs about 15 pounds and overall health and appearance / dental is amazing. I always offer him a safe clean area and access to the property I will be buying a breakaway collar with a GPS tracker for him, he’s a farm cat my neighbor and me watch after. Would this be something to just give more time to mend? or should I step in and apply or seek help. Thank you! I will 100% be doing a donation, really wish more Vets were like you or highlighted in the community.

EDIT, the donation link via paypal says this is indelible, you can click 1-2 photos below that say Ads to be redirected to those to donate, if you have a place in mind please add it to the response I’d be happy to donate to your place of choice.