Hello. Thank you for writing to us at healthcaremagic
From your description this red spot does not seem like a lesion of
genital herpes.
Herpetic lesions are typically erosions or breaks in the skin and have a painful or burning sensation.
This seem more like a candidal
balanitis Or an
Irritant dermatitis to harsh cleansing of the delicate genital skin.
However, as your last sexual contact was an unprotected one, therefore, you must screen for STD's irrespective of symptoms and signs.
I suggest screening for HIV and
syphilis (VDRL/RPR) at 1 month irrespective of symptoms or signs. It should be repeated at 3 months for a conclusive result.
Herpes can be tested for by an ELISA test as early as 2-4 weeks after possible infection to look for circulating
antibodies against Hsv.
Moreover, if you notice any urethral discharge, burning sensation, erosions or ulcers, or warts/ growths in the genital region you most get yourself checked with a venereologist.
Regards
Always practice safe sex with a condom!