This is a definite possibility. She may have a “contact allergy”, especially if it is on the unhaired (exposed) regions of her undercarriage, and face, it is sudden onset, and never happened before. It could also be a reaction to fleas, other parasites, food or inhaled allergens. Your vet can prescribe medication to soothe and take the itch out while her skin has time to recover. Try and identify what she may have exposed herself to.
Hey! If they look like pimples or little clearish white blisters, I truly believe they may be ant bites...I have 2 dogs that have severe allergies to the grass...they eat wellness dog food with kelp added, they get whiped off with baby wipes after going outside which minimizes some of the allergies & they get bathed twice a week (per vet instructions...its not the shampooing that dries them out, it is not rinsing them well enough) in shampoo from the vet...but I noticed one of my dogs had those pimple like bumps...they arent flea bites because flea bites are very tiny & red...if its blister like it is more than likely ant bites...give her a bath in collidial oatmeal shampoo....just when you think your dog is rinsed off...rinse again but don't rub too much or you will roughen up their skin....then for the pimples, put benadryl or hydrocortisone cream on it...if you have neosporin with pain relief that works too....I hope that helps :)
My dog had something similar, He is allergic to fleas. I took him to the vet and it turned out to be a staph infection. He was placed on antibiotics.
I took my dog in for the same thing about 2 months ago and my vet told me to get cortizone cream from your local store and smear that on their sore twice a day. This worked and it saved me a lot of money! Vet's are spend now days!!
Definitely go to the vet to get it looked at to be sure it is nothing that is to serious. If you are ever unsure of something call up the vets office and ask them what to do. If you need to bring your pet in do so.
Mine also. (not the white spots) can't get rid what the heck? He swims on the carpet just to itch his belly, must be painful.