Bald patch under tail?

Coco was sick all over the kitchen yesterday morning, there was a lot of hair in it.

Last night I noticed that she has created a significant bald patch on the underneath of her tail, not far from the base.

She was treated with Drontal and Frontline about 2 weeks ago and doesn’t seem unwell in herself otherwise.

Any ideas? I could really do without going to the vets again but need to get it sorted.

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