Amoxycilllin is prone to develop allergy in some patients. For you till you take the drug for 10 days there was NO reaction by the body to release Histamine which produces allergic reaction
. Reaction started after you stopped the drug. Whatever may be the presentation of symptoms, even though Amoxycillin
can't be ruled out it is very difficult to diagnose cause of skin allergy
. The way you explain allergic reaction goes in favor of urticaria
. The treatment is antihistamine & if necessary steroids. consult your physician.