Is that a hickey or a tattoo?

Electrical engineers don't often have the best social skills, but they are taking over the Philly swing scene and I'm not about to complain.
I ventured into Philly last night for a swing social. Only my third event, and I'm not too good, but I try to follow. I smile. And I haven't elbowed anyone in the neck, yet (this did occur last night. Poor guy.) Swing socials are a great place for people who don't need alcohol to dance. Yes, such college students do exist! And they are pretty good dancers. And I appreciate being able to SEE who I am dancing with rather than just feel our bodies making contact and smelling the alcohol on his breath. It's a refreshing change.
The first five guys I danced with were studying electrical engineering. As one explained to me, his mind is always going so swing gives him something to focus on and it's a good way to make friends. Sounds good to me.
The opening question from another dancing partner (after, would you like to dance? (of course!)) : is that a hickey or a tattoo? I have temporary tattoos on (grapevines, they are quite nice and I'm growing rather fond of them). One is on my chest and I was wearing a v-neck,
So, because I didn't get to study all too much yesterday, I'm going to now throw some vocab at you. Stop reading here if you'd like.
Some were rather taciturn, too focused on dancing to talk. Others were more talkative and I met a lot of interesting people.
To some of my classmates, this type of dancing may seem archaic, something for older generations. But, as one dance partner pointed out, the lyrics are rather suggestive, perhaps more than some of the current songs!
Two girls, new to dancing, sat on the sides the whole time, chary to dance.
She needed a new prescription for her contact lenses as she struggled to descry the words on the street signs.
Thank goodness none of my dance partners was fastidious! I am still a novice swinger.