Strange scabs, front leg baldness?

[Ejones06]

My cat C.C. (around 13 years old, indoor, this started about 2 weeks ago at most I'd say?) Has scabbing on the edges of her ears, as well as some on the inside (not far inside, I'd say half an inch in max). The ones on the inside are greenish yellow tint, but the edge scabs are red/brown (normal color). There are some scabs (mix of the two colors) developing on the outskirts of her eyes as well. She also has a scan under her fur on the back of her neck, as well as her chest area. Lastly, where her knees are on her front legs, there are fairly good size bald spots, and the skin is pink and looks irritated.
Her sister (same age, also indoor) has none of these symptoms aside from normal scabs from scratching.
They don't have fleas.
Any ideas?

[Ejones06]

Hi, she is indoor, grey and white, and here are the best pictures I could get (she isn't being photogenic today haha) they're on my art website so I'm sorry if the links are a little weird, it's the best I could think of:
http://sta.sh/21qejmr6wtkx?edit=1

[opus88]

hi Ejones and welcome. this condition is unfortunately quite common, in fact I dealt with it with one of mine a few years ago. Its an ALLERGY...to what remains to be discovered. Usually food is the culprit, yes even if the kitty has been eating the same thing for along time, infact this is why they do develop an allergy to a common ingredient that they have been over exposed to. can be beef, chicken, gluten so on...I will send you to a site. when there also click on the highlighted blue areas the say MILIARY DERMATITIS also EOSINOPHILIC PLAQUE. because it will be one of these conditions causing your kitty's troubles. Do an elimination diet, change the meat source in the food and if you are feeding dry food, change slowly over to canned....less preservatives that can also be the culprit. the article talks about treatments such as Antihistamines, Cyclosporine and Steroids...AVOID these if at all possible, use only as a LAST resort because they too cause medical problems. read this article and click on the titles I've shown you will see what I am talking about..also add a good OMEGA 3 fatty acid supplement to the canned food, these two changes alone maybe all you need...good luck, let us know if we can help more.  
http://www.peteducation.com/article.cfm?c=1+1332&aid=502

[Ejones06]

Okay so it is a food allergy! That's what I thought, so I already planned on a food switch (they've been eating this food their whole lives, so I expected that). I was going to switch to a no grain food (something organic) and if that doesn't work I'll try something else. I would try canned food, but I'm not home enough to keep that up if I'm being really honest. And if I'm not home my parents refuse to feed my cats, so that's why I use dry food.
Do you think the switch to organic food (we're buying the blue buffalo brand) might help? Or do I definitely need canned food?
(Also may I ask an irrelevant question about my other cat, it might be completely normal but I'm unsure lol)
Thank you, by the way!

[opus88]

Canned diet is much better to try cuz there are so many preservatives in dry that could be the problem.....also I'd try switching off Blue Buffalo too, it had a good reputation until lately. Use grain free is a real good choice, do the switch slowly tho so kitty will accept it, also less chances of diarrhea happening. If you get them on a canned diet, than maybe have a dry brand as a back up for when you are away

[zodiacqueen]

Hi, is CC indoor/outdoor?  What color is she?  Any way you can post some pics of the areas?

We'll be able to help you better with some pics.