
I Have A Fever Blister On My Upper Outside Lip.

need some further evaluation regarding...
Detailed Answer:
Hello and Welcome to 'Ask A Doctor' service...
I've gone through your query in details...
I can understand your concern...
Well, could you kindly upload/attach a picture of the blister, so that I can take a close look at it? You can simply upload/attach it to the Reports section of this webpage or even email the picture to YYYY@YYYY by keeping the Subject as ATTN: DrArnab, and I'll receive it.
As per your description, it's possible the blister got infected and now the infected materials forming an abscess.
The problem with popping, in that case, would be there's a chance of sudden spillage of infection to the surrounding area. The upper outer lip is a heavily vascular area and directly connected to the deep tissues as well as the brain. So, I wouldn't recommend unsupervised popping in that scenario.
Since it's already been three weeks, it's still hurting, and the blister hasn't broken yet, could all mean that the infected material may have been solidified.
It's a good thing that there's no fever yet. However, antibiotic therapy seems to be needed in that scenario after a check-up (in my patients, I'd generally recommend a 7-10days course of Co-Amoxyclav i.e. Augmentin). It'll help reduce the swelling and if, at all necessary, it can be popped under a strict sterile condition under your doctor's monitoring later on.
Please discuss this with your doctor and proceed accordingly...
Let me know if I can assist you further.
Take Care
Kind Regards

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