Hello, Welcome to healthcaremagic.com, From your complains- burning sensation on penis, itching over penis and groin region which started after having an unprotected sexual intercourse is suggestive of a sexually transmitted genital infection. To be more specific, if you have reddish coloured lesions, erosions/vesicles over genitals, painful to touch, mucoid discharge along with above mentioned complaints, than mostly likely you have contracted genital herpes. Genital herpes is caused by a virus named herpes simplex , contracted by having an unprotected vaginal/ anal/ oral sex. Usually first infection is severe as compared to recurrent infection. Frequency of recurrent infection is high. Diagnosis can be confirmed by ELISA detecting viral antigens. Treatment involves :- 1. Acyclovir an antiviral agents is used for suppressing the infection for 5-7 days is required. If number of recurrences is more than 9 times in a year than, treatment needs to be continued for about a year. 2. Maintain genital hygiene, wash genitals with luke warm normal saline solution, dry with soft cloth, don t apply any ointment, antiseptic agent to lesions, wear clean loose undergarments. 3. Avoid sexual intercourse for at least 2 weeks. Check whether your partner do have the similar lesions, if so than treatment is must for partner as well. 4. Precautions involves avoidance of unprotected sexual practices. Maintain healthy diet and drink plenty of fluids as well during treatment. I would suggest you to consult a venereologist as well, before starting treatment, get a screen done for other sexually transmitted diseases as well. Thank you.