white clusters and one clear blister very itchy and painful

Hi,
Welcome to ehealthforum,
The labial itching and pain could indicate infective causes. It is difficult to comment on the cause for the symptoms that you describe without examining you. The exact cause can only be made out after careful examination and evaluation. Visit your doctor/gynecologist at the earliest for further examination and assistance. Treatment as appropriate (based on examination results and investigation results) would be started to help you control the symptoms. Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Take adequate rest. Drink plenty of water. Maintain healthy diet. Use loose cotton undergarments and avoid use of tight fitting clothes. Avoid sweat accumulation in the area. Keep the area clean and dry. Avoid vaginal douching, or use of harsh soap or perfumes in the area. Use loose cotton undergarments and avoid use of tight fitting clothes. If infective cause is detected, and if you are sexually active, get your partner also treated simultaneously to prevent chances of re-infection, and avoid having intercourse while being on treatment.
Take care.