Thanks for the questionCustomer
In direct answer to your question : While I cannot diagnose this over the internet it sounds like your cat has a disease called miliary eczema. The distribution of the skin lesions
in miliary eczema are usually precisely as you describe.
The origin of this disease is almost certainly flea bites, owners will sometimes dispute this as they say they have not seen fleas but as it is a hypersensitivity reaction only one or two bites would cause the clinical signs you are seeing. Not all cat will get this disease following flea bites, only a few which are hypersensitive to fleas will develop the disease. It is therefor important to be absolutely fastidious not only with flea control on your cat but also the cat's environment. Although clearly fleas may be implicated as a trigger factor flea control alone will not cure this disease, more is required ...
Different vets have slightly different ways of thinking about things when it comes to treating this disease. There are two main treatments for miliary eczema both have their pros and cons. Ovarid and drugs like it are hormone preparations which are a perfectly valid treatment for treating miliary eczema but a very small number of cats end up as diabetics as a result of this drug. Steroids and antihistamines are also a valid treatment for this disease but again a very small number of cats end up with both acute and chronic side effects to steroids. Antibiotics may be used in the early stages as these cats often have a secondary bacterial infection.
I am so sorry I cannot recommend any home remedy here, because of the nature of the disease there is nothing much you can do on your own. Accordingly my advice has to be that you should have your vet check your cat over as soon as is practicable.
If I have not answered your question fully enough or if you would like to ask more I will be on line for the next hour or so and I will be pleased to discuss your question further.
Scott Nimmo BVMS MRCVS