What is the orange dot on top of the contacts symbol on Skype?

I was on my iPhone checking my Skype, when this orange circle with a 1 in it popped up on top of the contacts symbol. What does it mean and what do I do to make it go away?

You got a message from someone and it won't go away until you see it

It shows you got a message from that person and the number 1 is the amount of messages received, if you got 5 messages there would be a 5 in the circle

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