I think i have a bug bite, or spider bite, and ive grown a clear blister on my leg. and im not sure what to do about it ?

Lesion: Clean with soap and warm water. If you develop significant swelling, redness, black center with surrounding white tissue, purulent discharge or fever, than medical attention may be warranted.

Agree with Dr. F: When the blister ruptures, apply an antibiotic ointment to the wound, A triple antibiotic antibiotic is available over the counter. Wish you good health!