Dear friend, welcome and thanks for entrusting your query here at HCM!
I am Dr. Prasad Akole (Critical Care Expert- http://bit.ly/Dr-Prasad-Akole) and am glad to address to your query here.
It is not an allergic reaction
as there is no itch and has taken Zpak before.
Can stop Tessalon
and see if it reduces.
Watch for any giddiness, increase of rash
How large are the red bumps?
I hope you are fully satisfied with the guidance I gave.
I would be glad to answer any further queries. Please ask for any clarifications before closing and rating this answer.
Thank you and Good luck!