Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain
sore throat along with rash can be due to viral infection while rashes can also be due to
allergic reaction to some unknown allergen..
As it is happening to your other daughter too you need to consult an Infectious medicine specialist or Allergist and get her evaluated and he can advise a throat swab culture,
blood test etc to rule out the exact cause of the symptoms and treat you accordingly..
She can be advised a course of anti allergics like Allegra or
Benadryl..
You can apply cool compresses over the rashes..
Apply steroid ointment as it helps in reducing redness and itching..
You can also apply Calamine lotion to soothe the skin..
Avoid scratching the rashes if there is itching to prevent infection in the area..
For sore throat do warm saline gargles and steam inhalations..
You can suck throat lozenges and chew a
Vitamin C pellet daily..
You can avoid spicy and chilled foods and drink plenty of water..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.