skin allergies & problems

Hi! I'm new to the forum, and could use some advice. I have a 2 year old female mouse named "O". She started scratching herself and drinking an excessive amount of water about two months ago. I read (on this forum and online) that I could try Benadryl in her water and put triple antibiotic...

I have an orange female tabby who, every summer gets something like a rash from her ears down to her eyes. Some hair loss, but mostly just red with little black specks. She doesn't seem to have any discomfort from it. No scratching. This happens every spring & summer. By fall it disappears...