For those who are suffering something similar, my derm took a second look at it and determined the blister was actually a result of eczema. The remaining bump is apparently scar tissue, not a wart.
Thank you for your response.
I called my derm a few days ago (mostly to inquire the face tingling I had been getting as of late), and she told me to stop Accutane until the little blister heals. Then, to restart the course and see if the tingling goes away during my hiatus from isotretinoin.
The blister is gone, other than a raised red scar which is about 2 mm wide. My cold sores took two weeks to heal. Perhaps, this took a shorter while due to its size? I did have slight rashes on both my hands at the time I noticed the blister, and had neglected to apply and reapply lotion onto my hands. When I discovered the blister the second time, it didn't hurt. It was just there and wouldn't pop. It hurt after I had been (unwisely) poking at it for an hour.
Then I opened the blister with a tweezer.
I hope it's not herpetic whitlow!
Hello,
It can be herpetic whitlow or blisters due to pompholyx or dyshidrotic eczema. Herpetic whitlow is a painful viral infection occurring on the fingers or around the fingernails and is caused by infection with the herpes simplex virus (HSV). Eczema is a form of chronic dermatitis (rash).Allergic reaction is one of the important causes of eczema.
My sincere advice would be to get it evaluated from a dermatologist to confirm the diagnosis. It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your dermatologist. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
Note: I was outside in the freezing cold for some time before noticing the 2nd blister.