I wear a drysuit all the time. Fresh water and salt. I've only had hickeys in the cold salt water....never in cold fresh water.
If you're diving cold salt water it may be a rubbing irritation with the salt. When I was on the Nautilus Explorer in BC, they told me to use Bag Balm on my irritated neck AFTER I was done diving for the day and to wash it off before donning my suit the next day.
If you're diving cold salt water it may be a rubbing irritation with the salt. When I was on the Nautilus Explorer in BC, they told me to use Bag Balm on my irritated neck AFTER I was done diving for the day and to wash it off before donning my suit the next day.