our favorite chicken, charlie, has a lump under her right ear. i just noticed it this morning. she's acting fine but she sounds a little different then normal. i've been checking the forums and a suspect a sinus infection. it's round, solid but semi-firm, kind of like a small grape under the skin. i've read of people giving their chickens antibiotics. do they sell that over the counter? isn't that like contraband? what dosage should i give her? please look at my photo's of her. you'll see there is quite a difference between her right and left sides. thank you in advance.