Hi, Welcome to Healthcaremagic.com. I had gone through your question I can understand your concern. As you said you had unprotected oral sex there are two chances of irritation you feel. It can either be mucosal erosion or allergic reaction even it can be fungal infection too. If the irritation is on glance penis (out side) it is traumatic mucosal erosion, keep your part clean and use soft underwears there is no need to medical intervention. In case you have burning sensation, itching, or pain you may need to use Steroid cream like Betamethazone twice daily. It will also reduce your allergic reaction too. If the symptoms worsen you need to visit a general physician for further help. Regards Dr Muzaffer Hussain Parray