Temporary spotty bruises on thighs? Almost everyday for awhile very soon I've had these bruise like spots on...

Almost everyday for awhile now I've have these bruise like spots on my thighs. Kind of blue, with redishy spots, its kind of freshly spots everywhere. It happens on both legs but it doesn't last long. It's sometimes sore to walk, but no most important pain when touching it. Does anyone know what this could be?
Answers:    urticaria.

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