Here are some things:

Shampoo: If you bath your Boston make sure that you either have shampoo from your vet for their skin or try to but good quality OATMEAL shampoo. Dream coat has good products.

Food: high quality dog foods will always help get you a good coat and skin condition. If this is not enough Tuna in olive oil and eggs will help improve the dog's skin and coat. Always be care full with eggs, if you are not comfortable with feeding a raw egg, it is perfectly safe to serve them over easy or scrambled as long as you cook them slowly and on a low temperature. Remember never to feed an animal Tuna from a can, the chemicals they use to coat the insides of the cans is toxic to dogs and cats (OK if you are feeding one can per month). If you are feeding a dog tuna more than once a month buy it in the pouches.

Also, there are nice therapy diets that you can get from your vet. They are prescription diets from premium companies like Science Diet and Waltham/Royal Canine, (there is another one that is really good, it is natural and organic but I forget the name). Especially formulated to get a balanced nutrition + improve skin and coat condition.

Be careful of vets that have "contracts" with food companies they will recommend something from that brand insted of recmmending what they think is best for your pet. I know it sounds weird but Banfield, the pet hosptial in Petsmart would be a good place to go since they "choose" the food they recommend, they are not "TOLD" via a contract what to presribe.