I think you need to have ten posts before you can post a picture, so that may be why you are unable to. Its difficult to tell gender without a picture. Roosters are often larger than hens, so if your bird is larger, thats a sign that it could be a rooster. The red spots on the leg are normal (many birds have them)-- they don't help with telling the gender. Signs of a rooster include larger, redder comb and wattles (are its wattles and comb larger than your hens' wattles and combs?), pointy neck feathers and saddle feathers (the neck feathers of a female chicken will be rounded, and those of a male are generally longer and pointed. Saddle feathers are longer, pointy feathers near the tail-- hens don't get them, but roosters do), thicker legs (are its legs any thicker than your hens?), and sickle feathers in the tail (long curved feathers in the tail-- these only develop once a rooster is about 5 months old). If your bird has several of these signs, you likely have a rooster.