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My cat also has a similar reaction. We don't exactly know why, but we suspect it's fleas as he will occasionally get scabby around the common flea areas like the base of the tail. He then starts to over-groom and pull off his fur. Our vet gives him an anti-inflammatory injection, which helps immediately, then the same in pill form to keep the itching at bay and promote hair regrowth.
So if it is fleas, it could be that the allergic reaction only lasts a small while, but the resulting dermatitis lasts longer. The other option is a stressful event that causes a bit of miliary dermatitis, that then snowballs.
Would be interested to hear what your vet says/does.
My cat has quite an adverse reaction to fleas, he gets scabby. Then he gets bald. Weve got on top of the flea situatuon but the poor boy is really stressed out. He sleeps in his litter tray. (Its not being used) this morning he came for a cuddle in bed, first time in weeks.
He has a brother, maybe hes stressing him out a bit too?
Im taking him to the vets I think, what should I expect?