if it's viral there's absolutely nothing you can do about it and it's probably a virus called roseola; you simply just have to let your body fight the virus on its own until it eventually overcomes it. i personally had this virus before and it lasted up to three months. if it's anything fungal it would definitely be itchy therefore i would safely rule that possibility out. if it's a bug bite (seeing as how most bug bites become itchy and somewhat sensitive) it's unlikely to be a mosquito unless you're allergic to them and the bumps are massive in size; my guess is that you have been bitten up by a spider of some sort yet not a black widow or a brown recluse seeing as how the center "dimple" of the bump would become much darker in color -- and they tend to spew out pus as well.
non-itchy raised bumps at leg with central dimple. viral or fungal? bug bite?