On day two of taking amoxicillin for an abscess the swelling is worse is that bad?

See a doctor: If the antibiotics are not working, then you need to see a doctor for a re-analysis of the problem. Abscesses are often caused by Staph, and sometimes MRSA, which is resistant to standard antibiotics like amoxicillin. I would call today and try to get seen. If you have fever, increased pain or other concerning symptoms, you should take immediate action to get better.