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Hi. I'm Dr. Denise, a licensed veterinarian. I'm here to help with your concerns regarding Sydney.
Where on his muzzle was the affected area of skin (on the top, near his mouth, etc)?
Ok, a few different things could be happening for Sydney.
He may be healing normally with hair falling out around the edges as the skin heals.
If bacterial, the infection may be spreading to a larger area. Especially if there are open/bleeding sores. He may need a longer course of his antibiotics.
There may be something more than a bacterial infection occurring for Sydney. Ringworm is a potential fungal infection that can cause hair to fall out and create scabs.
In all, a recommend a progress exam with your veterinarian as soon as possible so that his skin can be assessed and additional diagnostics (like a skin impression or skin scraping) can be performed, and additional treatment prescribed if needed.
If it has been several weeks since finishing the antibiotics and now the mini scabs are appearing, it may be that the antibiotics worked to control 80-90% of the infection, but now the bacteria is growing again. Sydney may need a longer course of antibiotics to control the infection to resolution.
I'm glad that your vet did not the infection was consistent with ringworm after the Wood's lamp. If the scabs and irritation to not improve entirely with additional treatment (oral antibiotics +/- topical ointment), I would recommend a DTM culture to completely rule out ringworm, as it is contagious to people.
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