Welcome and thanks for posting your query to the forum.
It seems from your problem that you suffered from the problem of "folliculitis" over the inner labia.
Folliculitis is a common problem which arises due to blockage of pores of oil glands which are attached to the hair shaft. Due this blockage we feel the sensation of mild itching or tingling
which may get converted into pain sensation.
It is a common problem over hairy areas such as at genital region. Once the folliculitis is healing it leaves behind the area as blackish crust or scab over the affected area.
So you should not be confused for any type of sexually transmitted disease
or related thing. In between kindly do not pinch, pop or squeeze the area as can aggravate the situation.
You need not to do anything for it actively as the scab will fall off by itself in few days of time. At the mximum you can do warm water compresses over the affected area.
In future to present such situation you should maintain good hygiene, wear cotton clothes and cotton undergarments.
Hope these informations are helpful.
"Wish you good health"
Dr Sanjay Kumar Kanodia
MD (Dermatology & STDs)