23 days post-op. What could this red, hard spot be? (Photo)

I'm here for a second opinion. I've had the small red, warm area above my body lift incision since Monday or Tuesday. I'm 23 days post op. I saw my Dr and he didn't think it was anything to worry about and told me to massage it. I waited a couple days and it's still there, so he put me on antibiotics just in case. I've been on antibiotics for 24 hours. I'm very anxious because my PS is out of state and I just was released to come home 2 days ago. What could this red, hard spot be?

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