It's been two days. Still swollen. Do I pop a spider bite blister? It is small red is going away not a brown recluse.

No. See you doctor for an evaluation and if an i & d ( incision and drainage) is needed, the doctor could do this with sterile technique and place you on meds if needed.
No. Let your doctor pop it, since you may need to culture the content to get more definite diagnosis.