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If it is a scaly rash, many 'splatter' shaped on the back it possibly suggests fungal infection
called Pityriasis rosea
. Sher needs to avoid using drying agents like soap for a while. Use moisturiser cream over the area. She can take an antihistamine like Tablet Cetrizine
10mg at night over food, with water to relieve her from itching. Show her to the Dermatologist
for a thorough examination and appropriate treatment.