Snorkelling can be a great form of exercise. It can be great fun exploring underwater worlds and watching fish swim around freely in the wild. You can see crabs, seaweed, amazing rock formations and even coral in some parts of the world. Unfortunately there are several ear problems caused by snorkelling. You need to look after your ears so you don't end up with infections. Seawater is laden with bacteria and can easily cause infections if you are a frequent snorkeller. Protect yourself with a pair of swimming earplugs which will help by keeping your ears dry and free from water.
Itching is an early indication of an infection being on its way. Otitis externa is the medical name for this and it is more common in those with eczema, psoriasis or other skin conditions affecting the ears. These cause tiny breaks in the skin which allow water and bacteria to enter, resulting in infection. Visit your GP if you think you may have an infection. They will examine you and will give you antibiotic eardrops if they consider these to be necessary. Gentamicin is a common antibiotic used in this circumstance.
Steroid drops and antifungal drops may also be used. Swimming earplugs and snorkelling earplugs from http://zenplugs.com are ideally antibacterial. This can help to stop infection. It is also helpful if they are joined on a string so that you don't lose them if one comes out when you're in the water. You can tie the cord on to any loose string on your wetsuit zipper so you can always find them. A bright colour is a good choice so that you can spot them easily on the seabed.