Of course, there are other causes of cats hair loss. Cats can have a type of obsessive/compulsive disorder and lick themselves until their skin is raw. Sedatives and antidepressants along with Feliway can help such disorders, but there is no doubt in my mind that this is not the problem that Whiskers has. Also, the open sore on his lip is almost definitely not from his licking, but is another allergic reaction to the fleas, often referred to as Rodent Ulcer (eosinophilic ulcer). The steroids will help with that condition also.
Sunburn should be avoided by keeping cats confined during the warmer part of the day. Anybody who has experienced sunburn knows how painful it is, and just like humans, cats can develop cancer from exposure to the sun (see below).
Squamous cell carcinoma
This is due to a malignant tumour of the skin and is most commonly caused by excess sun exposure. Any part of the cat’s body can be affected, but areas with little or no skin are most at risk, that includes the ear tips and the nose. As with sunburn, cats with light coats are at greater risk due to the lack of melanin in the skin.
Symptoms of squamous cell carcinoma include red and crusted sores, bleeding ulcers which won’t heal and hair loss. Treatment includes surgery to remove the affected area and chemotherapy or radiation therapy. Pemphigus complex A group of rare auto immune skin disorders affecting the skin. There are three types of pemphigus in cats depending on the layer of skin involved.
5mg a day was too much and he was having bad side effects, extreme lethargy, he stopped eating,and drinking and his diarrhea actually got worse. Half a pill ever other day was not enough his stool was normal the first day then back to diarrhea the second. Half a pill mg a day seems to be the formula that works for him. He tolerates it well,and his stool remains normal. Mischief is much more active and healthy now,and is actually gaining weight. I am very pleased. Like I said I think it saved his life. Also the drug is very inexpensive $10 bucks a month