I am 4 weeks post-op from a breast reduction. Is this pimple/blister above the incision line normal? (Photos)

I had a breast reduction 4 weeks ago and everything seems to be healing smoothly except that yesterday I noticed this pimple looking bump right above my incision line. I left it alone but I pulled up my sports bra a bit and felt it pop so when I went to check it it looked like a little hole and was bleeding a bit. My PS said that it was just a pimple and when I sent him the picture of it after it popped he said it was normal. I just want a second opinion and make sure that It's not infected or anything

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