Within the last week, red marks have been appearing first on my calves, then knees, ankles and now wrists. They are not raised or on the surface. They look very much like a red burn mark or like someone used a red marker on me. Most are in a line formation with some being dots. One circle (1") has begun to fade. They're like red port-wine birthmarks. Two that first appeared on my knee were sensitive to touch for a few hours and felt like a burn. Any idea what this could be?