Welcome to Heathcare Magic Physician's Desk!
I think you got bitten by some insect there in Lanka but there is also a faint possibility of having a parasite on your clothing like a bug or scabies
infestation which is continuing to hurt you.
A close shot photograph of the skin lesions can help in a great way if you can load one.
You should take a systemic antihistaminic like chlorpheniramine
4mg thrice a day along with local application of steroids
Wish you a great health!