Oh dear! Is she cut or is there a swelling? She may need a shot of antibiotics. If you got in touch with a cat welfare organization they should give you advise. They may even come to visit to see if they can administer treatment.
If it is a bald patch with scaley skin viible it could be due to a flea allergy or ringworm. These will definatly need treatment as all the other cats will soon get it too. I really feel for you as you want the best for them and don't want to upset them. I hope things work out for you and the kitties.
I really don't know what else to suggest.
Good luck!
Angelkiss x
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