Ronda, thank you so much for bringing us your case. In addition to topical recommendations, I have several inquiries:
1. How is nutrition?
2. This appears more venous in nature secondary to edema and superficial varicosities--is this accurate?
3. If there is venous disease, has she had any studies that would indicate her disease is amenable to intervention? Any concerns for arterial compromise?
4. If venous, is compression utilized?
5. Who changes her dressing, and what is her social/living situation?
6. Does she have any allergies?
7. What is being used for wound cleanser/overall foot cleanser?
8. Referencing the recent culture, was this taken due to stalled progress, or local or systemic signs/symptoms?
9. How is overall hygiene?
Preliminarily without above clarifications, my thoughts for topical recommendations only would include cleansing the wound and foot with Vashe, leaving vashe soaked gauze on the wound for 10 minutes if possible prior to dressing reapplication. If only able to accomplish this in clinic, that is acceptable. I would recommend using a broad spectrum antimicrobial like iodoflex/iodosorb, (with foam or other to separate the afflicted digits) which depending on exudate level, may be left intact for several days. You may also paint normal betadine between the toes to discourage fungal growth.
If she is wearing socks and no other secondary dressing is used over a gauze wrap, you might ensure she is laundering the socks appropriately and not re-using them. Also, ensure clean socks are applied daily if possible.