回复：Thank you all for the responses! formyson:

Erythromycin and Benzoyl Peroxide Topical Gel, USP (Sandoz)
This is a cream mixed with alcohol but did not work well for my son.
Clindamycin Phosphate (Fougera)
This one is a solution, it works for my son.
We got the prescriptions from his pediatrician.
Do not worry too much. Enjoy the process of your son's growing up. The handsome young man will be back soon:)