[header] How to treat herpes [title] Get an accurate diagnosis from your doctor. [step] Herpes blisters are small, red, and filled with a yellowish fluid. Small blisters can cluster together and grow into a larger blister. 
To rule out other causes, have your doctor examine the blisters and, if necessary, take a viral culture. [substeps] Herpes virus type 1 usually causes blisters around the mouth, and herpes virus type 2 usually causes genital outbreaks.