You can go ahead and call the groomer, but I suspect that the groomer expressed the anal glands and may have even used a little more force than necessary. Many dogs after having the glands expressed continue to have discomfort in the area for a few days. Since you are seeing a little seepage, it might even indicate that there may be a bit of infection in the area.
You might try alternating warm compress with some cold packs. Sometime this will help ease some of the discomfort and the ice can help if there is inflammation. Check to be sure there isn't a rupture which might look like a sore area near the rectum. If there is, you could flush the area with warm water, disinfect with hydrogen peroxide and apply neosporin a few times a day.
If the behavior continues to be excessive, then I would have her checked over by your vet . Here is a great site on the anal glands.
Another reason for a dog to lick the rectal area excessively would be tapeworms. Tapeworms release segments that exit the anus and spread tapeworm eggs into the environment. They can cause severe itching in some dogs. They can usually be seen in the stool and are small about 1/2 inch moving things. If the stool has dried, they look like rice in the stool or stuck in the hair around the anus. Drontal plus is also a prescription product and is used for the treatment of Tapeworms, though dewormers with praziquantel work well against tapeworms.
An allergic condition might cause excessive licking as well. If the hair wasn't trimmed back in the area, dried fecal matter caught in the hair might be a cause as well. If the hair was trimmed way back, she may have sustained a mild burn from the clippers or even a nick leading to the licking. Triple antibiotic ointment or neosporin would be appropriate for this as well.
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