Erythema is a skin inflammation on the fatty layer of the skin. On spreading of the legs, they give the skin a red appearance along with pain and tender lumps. The lumps could vary in size from one to five centimeters. They usually affect the front part of the legs. Erythema is a self-limited skin condition and even if no treatment is taken, it can clear off by itself within a period of 3 to 6 weeks. After healing, it may leave behind a bruised appearance over the area where the fatty layers had been destroyed. This, however, fades with time.