I have white spots/lumps on the sides, heels and soles of my feet. they are extremley itchy and have only appeared over the past couple days.

Athletes Foot: You have athletes foot, common in teenagers and people who are physically active, use public showers, and/or sweat in their shoegear. Recommend treatment with an over the counter antifungal, like Gold Bonds medicated foot powder/spray, or Tinactin (tolnaftate) powder/spray/cream. This will clear up your problem in 10-14 days if used as directed on the label.