And 'swimmers ear' and gross looking hair and dry and flaky skin (to name just a few)......
However it's fine as a low-impact form of cardio as long as you don't have probs with the above!
I'm not convinced that swimming makes you 'bulky'. I just think that those that do BEST at swimming tend to have a longer torso and higher %bf (for biomechanical and floatation reasons) which makes them look less than ripped/athletic. After all, there seems to be no advantage to being ultra lean in the water so why bother (just ask the next seal or whale you bump into LOL).