No STD causes such symptoms. This skin condition probably has nothing at all to do with the sexual exposure 2 weeks earlier. See a doctor if the symptoms continue.
I don't normally look at posted photos, but I think you may have a minor skin condition called lichen planus. It's not an STD and harmless. Look it up on line and see if other posted photos look like yours. Also look in your mouth and see if there are whitish/lavender stripes on the inside of your cheeks.
You should see a doctor for confirmation and treatment.
Ok thank you for taking time to look at my issue Howard.
I've looked at photos and I believe that this might be it.
I did receive econazole cream as my doctor believed this was a fungal infection.
Once again thanks for your input!
If it's LP, a cortisone cream probably will be more effective.