Itching Again

After a few weeks of reprieve, itchy welts are beginning to appear on my arms and shoulders again. I hope this does not turn into a full-blown itch like before that needed anti-histamines. The doctor prescribed a 2-week supply of Claritin (Loratadine). If that does not work, I will revert back to Zyrtec (Cetirizine) which has worked quite well thus far.