I am new to backyard chicken keeping. I have two two month old chicks, A Potchestroom Koekoek (which I imagine no-one will have heard of as it is a South African cross breed) and a rhode island red. Yesterday I noticed the rhode island red had a lump on t he side of her face. I did some googling and believe it is a sinus infection. There is no discharge, no smell, no trouble breathing etc... just ht slump, but today it is almost double in size. Today she also has what look like some peck marks/scratches on her comb. I have put vinegar on the comb and will keep an eye on her, but how do I treat the sinus infection? Please note, being in South Africa, it is better if you not refer to products by their brand names, as it will all be different here.