Hi
I've had a look at your pictures. It looks quite a large area of sore skin. Do you see her licking the area a lot? looks to me like she might be overgrooming the skin. The most common cause of that is a flea dermatitis so that is the first thing you need to do is rule that out by using an effective flea control product. Unfortunately skin conditions aren't all easy to diagnose without doing some tests. You can't rule out ringworm just because its not in a distinct circle. In my experience a ringworm lesion is almost never in a circle. If simple flea control doesnt clear the soreness I am afraid you need a diagnosis of her problem and treatment from your vet.
Cathy Wickenden BVet Med MRCVS
Barton Lodge Veterinary Centre
1 Midland Road, Hemel Hempstead, Hertfordshire, HP2 5BH
Tel: 01442 216048 24 hours
[
www.bartonlodgevets.co.uk]