Hard to say without seeing it, but it sounds like irritation from friction. Once a skin spot is irritated, it can be more sensitive for a time, which probably accounts for the recurrence. I suggest reducing friction-inducing activities for a while and keeping the area moisturized. You should be fine. If the symptoms persist, or if you can see a skin change that won't go away, you'll need to see a doctor in person.
Take care.
Dr. Rockoff
Devendrab
***@****