Round red marks on my legs?

About 6 months ago I noticed a small, round red mark on my right leg, just above my foot. It wasn't dry or scaly, and I thought it was some sort of bruise and forgot about it. 6 months on it is bigger than it was before, and there are more. I have a huge one on my right thigh and 3 more on my left leg. They don't hurt or itch, aren't dry or scaly but they just keep growing. Only on my legs, nowhere else. They look like a round shape, red, with little darker red pin prick marks on them. They disappear under glass though and I feel fit and well in my self (currently 8 weeks pregnant and always chasing after my hyper 2 year old Son). Any ideas? My gp said dry skin but they don't feel dry and the cream I used hasn't made a difference. I'm a very clean person. Oh and I'm a 24 year old female. Thanks in advance.