[Mimi]

I think it might be fungus. It starts at the paws, then on and around the mouth, in the eyes and lastly around their genitals. It is very difficult to eradicate but possible. It is as you say worse in winter because of the wet grass. There is a website that tells you how to handle this but apparently it takes a long time to work. Persistence however is important for your pet. I will try and find the website and post the url here for you.

 

[Mimi]

I found this which I had saved 'in case'.
Ways to Control Yeast / Fungus Overgrowth
Treatment: External Problems
Bathe: Use a sulfur-based or medicated shampoo for fungus, one with Ketoconazole - KetoChlor Shampoo by VirBac - have your vet order it for you.
Then use a Baking Soda rinse after shampooing, it will be quite helpful with the overall itchiness, skin problems and inflammation.
BAKING SODA RINSE RECIPE
Mix two (2) teaspoons of BAKING SODA per gallon of warm water; make sure to mix it so it completely dissolves - pour over pet - do not rinse off.
After bathing and animal is dry: Prepare a 2 % solution of Oxy-Drops (Mix 1 teaspoon with 1 cup (8ozs.) of distilled water). Use this to spray or wipe skin, ears, and feet with to prevent secondary bacterial infection. (order below). Some people report wiping areas with Listerine stops itching.

I couldn't find the original website but here is one I found that has a similar treatment.
Candida Albicans - Is This The Root of Many Allergies and Bloat/Torsion

Good luck.

 

[Mimi]

Poor little thing. It must drive her mad! You have to be persistent with the treatment though. I understand it takes sometime before it gets better. Let us know how you go.