This looks like <span style = 'background-color: #dae8f4'>urticaria</span>
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 dand
er, or cosmetics. Since your sister experienced an itch, just tell her to go over these possibilities in your mind. Something may strike her.