This looks like urticaria or hives. The swellings or wheals produced after itching can be pale (of skin color) or red. Urticaria is usually triggered by allergens, such as drugs, foods, insect bites, inhaled substances, in response to sunlight, cold, heat, stress, exercise, or a viral infection. Other common allergens are pollen, mold, dust, pet dander, or cosmetics. Since you experienced an itch, just go over these possibilities in your mind. Something may strike you. In many cases, hives clear up themselves and don’t require diagnosis or treatment. However if they persists you may need to see a specialist called an allergist to determine what is causing the reaction. Fungal infections also come up whenever there is moisture or temperature difference and Tinea versicolor can cause whole body itch. Over the counter antihistamines help. Calamine lotions and other over the counter preparations with camphor/menthol do help to reduce the itch. Try a soft cotton ball dipped in cool water applied over the itchy areas instead. Calamine lotions and other over the counter preparations with camphor/menthol can be applied after the cool water application.
Itchy localized rash can be due to allergic dermatitis, eczema, scabies, contact dermatitis, shingles, psoriasis, fungal infection like or Tinea. Please consult your PCP for primary examination followed by proper referral to a skin specialist. Take care!
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