Skin allergy, whether to poison oak or some other contactant or chemical, always involves not just sensitivity, but an actual eruption. This is generally red, dry-feeling, and scaly.
For that reason, and because the location of your sensation does not line up with any particular contactant, I doubt that allergy is at play. Therefore, changing soaps, detergents, and similar environmental things is not necessary.
Hypersensitivity of this kind may reflect irritation of the sensory nerve in this area. This may be secondary to stress, or to nothing at all.
I would suggest that you apply a topical anesthetic. Over-the-counter preparations in this category include camphor, menthol, diphenhydramine, and pramoxine (not hydrocortisone.) Ask your pharmacist to recommend a product with one of these ingredients, and apply it as often as needed, even several times a day.
If the sensitivity recedes, forget about it. If a rash appears or the feeling persists for a couple of weeks, show a dermatologist.
Bet you won't have to, though.
Best.
Dr. Rockoff
I've had the same condition for the last couple weeks on my inner thigh. It's driving me nuts. What helped (if anything). How long did it take to subside? Please email me, I'd like your opinion.