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About a month ago, a U-shape red mark appeared on my friend's 83 year old mother's leg. The original size and appearance of the mark was very much like a tooth-bite wound with U shape, but keeping growing in size in the last 4 weeks, and now became more than 4 times larger (in area) and a heart-shape red circle.

The skin color inside the red circle is clearly darker than outside, and the red circle itself looks like a scratch wound.



I can't see the pics but from the description, it sounds like a fungal infection. If the red area is itchy and dry, then it almost certainly is. You'll need an anti-fungal cream for ringworm.