I wonder if anyone can help. My 15 month DS has had a hydracele in his left testicle since he was born. The doctor said to keep an eye on it and that it should disappear. It hasn't disappeared though and his nursery called me today to say that it had suddenly doubled in size and they're right, it has. They think it's a hernia - he has had a very bad cough recently but I don't know enough about these things to judge what it is. Should I take him to the doctor ASAP or can it wait for a few days until I'm off work? I'm not sure it's serious enough to call nhs direct. Thanks.