Hello,
Thank you for your query at DoctorSpring.com
I understand your concern.
If it is not increasing in size and the pain is bearable then you can wait till tomorrow.
Meanwhile, you should clean the boil with betadine solution if you have, and apply Mupirocin ointment on the boil.
If you can, you can upload a picture of the boil for me to review?
Hope this was helpful,
Regards.