These don’t seem like typical rashes from a medication. They tend to be more symmetrical on both sides of the body and generalized. Some can be blotchy like hives. The photo you posted really look like flea bites, especially since they’re primarily on your legs. You don’t have to have pets to get flea bites and it would most likely not be from your bedding. Has nothing to do with cleanliness. Fleas are opportunistic! 😉

Have you been sitting outside with feet on the ground such as patio or deck? That’s how I got flea bites and they looked very much like your photos…and itch like crazy.