Veterinary questions? Ask a Vet for Answers ASAP
You're through to Dr. Edele, a UK vet.
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I'm just going to review the images you have sent now.
She's a very pretty girl.
I have a couple of questions to help me advise you.
Is she bothered by it?
Is it wet/dry or crusty? (hard to tell on photo)
What change in it have you noticed over the last few days?
Thank you. It may be that she has been stung by a wasp/bee or nettle or that she came into contact with something that has caused some irritation. Monitor it for the moment and gently bathe it with saline (half tsp salt in a mug of cooled boiled water) and then pat the area dry. Avoid applying any creams as letting these irritations breathe tend to be the best course of action to prevent bacterial infection.
Have you any anti-histamine medications? What brand/drug?
That's most likely the issue. You can give her some anti-histamine to help with the inflammation.
She can have half a piriton (chlorpheniramine 4mg tablet) three times per day for 2-3 days. If you have a different brand, just let me know and I'll calculate a dose for her.