Why did my nipples become cut and sore after going into the ocean?

I am at the shore, and i've gone into the the deep for the later two days. When i come out of the wter yeasterday, my nipples be sore, and when i get through near the marine today, i have developed cuts right on my nipples. i be wondering why this happend, or what i can do to soothe them...
Answers:

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Salt crystalises contained by your bathing suit and after rubs on your nipples - a bit close to flavoursome sandpaper! Ow! You could put bandaids over your nipples to stop further irritation.

Why are my nipples really sore all the time, Help!?

it might be the saline hose down...?