It sounds uncomfortable to have white rashes with black dots on your skin. This could be a type of allergic reaction or a skin condition that needs proper evaluation.

• You can consider taking an antihistamine like cetirizine, which helps reduce allergy symptoms such as itching and rashes. However, it should be taken only after consulting a doctor.
• Avoid scratching the affected area to prevent infection or worsening of the rash.
• Keep the skin clean and dry, and use mild, fragrance-free soaps.
• If the rash spreads, becomes painful, or you develop other symptoms like fever, see a dermatologist promptly.
• Since your symptoms involve visible changes like black dots, it is important to get a professional skin examination to identify the exact cause and receive appropriate treatment.

Please consult a dermatologist for an accurate diagnosis and personalized treatment plan. If symptoms worsen or you experience difficulty breathing or swelling, seek emergency care immediately.