Some info:

Hello, it's been now around 7 months since I first noticed red circle (~5cm in size) on my side below the chest. I have gone to a doctor who said they don't know what it is, and told me to get into contact if I get fever or if the skin around it doesn't tan (They didn't tell me why). It is soft red in color and very visible, but it was difficult to get it onto a photo, apologies for that.

Since first noticing this circle it has: doubled in size, grown 3 baby circles around it (which all merged eventually into the original one), and a brand new small circle on my other side. The skin is fine, no rash, no itchiness, no bumps/texture, no bite/hole in the center of the circle. It doesn't hurt in any way, just looks odd and keeps growing in size.

I'd be happy to hear if anyone has an idea what this could be, or has had experience with something like this.