Pain and drainage from fingers

I've been taking Isotrentinoin capsules for my acne for about 3 or so months.  My skin and lips are very dry, but that is a known side effect.  What I'm concerned about are my fingernails.  I have three minor and one rather serious ingrown fingernails, or at least that's what I think they are.  I have drainage from all 4 of them and am experiencing pain from the two that are the most serious.   I visited my dermatologist a couple weeks ago and he gave me a Thymol 4% in 99% Ethanol solution to drop onto the affected fingernails.  He told me that he wanted to dry the affected areas out to stop the infection.  I would like to know if these fingernails are a side effect from the Isotrentinoin, what to do with these affected fingernails, and how to properly care for, clean, and dress them.
Thank you so much for your help