My wife and I have an almost 2 year old pug named Khloe. A few months ago she had a small bump on her chest which looked like an insect bite. We didn't think anything of it thinking it might be a mosquito bite. After a couple of weeks we noticed it grew to look like a blister but it was firm. so we took her to the vet and she was put on antibiotics. But that did nothing but cause this bump to grow larger. So thinking it might be a mast cell tumor, the vet recommended we have it removed which we did. The biopsy however came back as negative for mast cell tumor and inconclusive for what the bump really was. About a month later, she got 4 similar looking "bug bites" on her back which caused us to worry because we were afraid she would have to get surgery again. This time around the bumps turned into small bald patches on her back and one on her hid leg. She also grew the same bump on her chest again. We've taken her to the vet now twice and they don't know what's going on. They have prescribed antibiotics and anti-fungal pills and creams but nothing is working. The patches are bald with some skin flaking off and slightly raised. I'm on the verge of taking her to a dog dermatologist but I wanted to see if anyone had a similar problem and could give me a heads up. I'm posting pictures of the bald patches.