Hello, Small itchy red bumps on the skin that disappear with no marks or scars are suggestive of urticaria. Occasionally one can have swellings of the lipsand/or tongue. In most cases (80%) it is not allergic and long-acting non-sedating antihistamines such as Allegra 180/90 and/or cetirizine 10mg for 6 weeks (minimum) to 3 months (most likely will be required in your case) is recommended. Infections can be a trigger so basic investigations to exclude infections are sometimes helpful. Food allergies are not a cause unless there is a specific food you are aware of that causes the lumps within the hour of having the food. I hope that was useful.