Thanks for your query,based on the facts that you have posted it appears that your boyfriend is getting bumps over glans penis
after having unprotected sex .
This is most likely to be due to allergic reaction
to your vaginal secretions which are acidic in nature.
Please both of you take broad spectrum antibiotic like Cefexine along with anti inflammatory drug like Diclofenac
Ensure to wash your genitals with warm water twice daily
Ensure to avoid sexual encounters till it heals up completely.