It is important to clarify if this is an allergic reaction or a true skin infection, as they require completely different treatments. Applying steroid creams (common for allergies) can actually worsen a bacterial or fungal infection. For temporary relief from itching, you may take an over-the-counter oral antihistamine like Cetirizine or Loratadine. Wash the area gently with a mild cleanser and avoid picking at the bumps. I strongly recommend consulting a doctor or dermatologist for an accurate diagnosis so they can prescribe the correct medication, such as a topical antibiotic cream for an infection or a specific steroid cream for an allergy.