Amber had mudfever and cellulitis a few weeks ago. My vet also said don't scrub - it's too harsh and can make things worse as it can make the skin so sore when the key to healing up and prevention is healthy skin. He said to use baby oil on the scabby areas for 3 days to soften scabs. After that to use warm water and a rubber curry comb and gently ease the scabs away with very dilute hibiscrub once a day. Then to dry the legs well with kitchen roll - no rubbing with towels. And he gave me steroid and antibiotic cream in an emollient base to use twice a day after day 3 over the top of any scabs that were still there and on the skin under scabs there the scabs had come away. She was fine within a week of the cream being started. I did keep her in for the first few days though so the area stayed clean and dry. It was a change from the advice I had before about the need to scrub scabs off. I hope she feels better soon. That looks very sore.