| this could be due to something like shaving/waxing/epilating your legs, it could also be a reaction to something like washing powder in your clothes or shower gel. . . or pets as the expert said there.
Try leaving your legs and not shaving them or anything, use a soap with no added perfumes or anything like that and if you have recently changed what you wash your clothes with, change it back. With them being just o nthe lower parts of your legs though I think it is more likely to be bites from something or something to do with removing hair? | 
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