Dermatology Questions? Ask an Online Dermatologist.
Thanks for your question.
If you have had unprotected intercourse with a partner whose status regarding STD is not known it would be safer to have yourself tested for STD.
Though with the history of sore forming after you pulled of the scab it is less likely to be a STD.It is more likely to be a raw area left after scab is removed and should heal without any problem.
This is my initial answer.Please reply if you need any clarification.
Please upload a picture.
I can see only one.
It is hazy.Can you upload a clearer one?
Did you get any blister before this scabbing?
Yes I did get it?
How long after the unprotected intercourse did you have these lesions?
This does not look like syphilis.The lesion of syphilis appears 3 to 90 days after exposure with average of 21 days and is different in appearance.Ulceration of the lesion is late.
This does not seem like herpes.Blister formation usually occurs before scab formation in herpes.It can often be associated with flu like symptoms.
Most likely scabbing from a cut.
Still as I advised earlier you should have tests done for STD as you have had unprotected intercourse even if a short duration one.