Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain itchy rashes over the arms along with red spots after
Tonsillectomy along with a previous history of having drug reaction seems most probably be due to
allergic reaction to medications only in the present condition also..
As after tonsillectomy procedure the patient is advised to take a course of antibiotics and painkillers and antibiotics can cause allergic reaction leading to itchy rashes..
Therefore you should consult your treating surgeon and get evaluated and he can change the antibiotics and also advise you antihistamines/anti-allergics like Levocetrizine or
Allegra to relieve the itching and rashes..
You can also do cool compresses over the rashes..
Apply
calamine lotion to soothe the skin..
You can also apply
steroid ointment to reduce inflammation and itching..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.