Hi,
I have read your query & the itchy bumps behind the neck usually occur due to tropical climatic conditions.
Wear loose-fitting cotton clothes (avoid rubbing from fabrics) & stay in a cool, well-ventilated area(avoid
sun allergy). Use medicated soap, wash 3-4 times daily.
Eat veggies, berries & fruits avoid non-vegetarian food (
food allergy). Do not scratch, they may cause scarring & complicate to
keloids. Change your mattress to avoid bug bites.
If the medications you have been taking are not working, visit a
dermatologist you might need corticosteroid injections.
Get physically examined for you may be evaluated for compression therapy, cryosurgery/
laser therapy, excision, etc. Stay away from addictions if any.
Take plenty of water to flush out toxic contents out of your body.
Hope I have answered your query. Let me know if I can assist you further.