If its only one site that is bothering you then it seems like it Papular Urticaria
which is the condition resulting in after an insect bite or even after crawling on your body cos they can leave their body parts like faeces or wings etc.
So if such is the case then you can start 1: apply 1% Hydricortisone ointment on the affected areas two times a day for 3-5 days.
2: Tablet Zyrtec
10 mg once a day before going to bed for 3-5 days.
lotion,apply on the affected areas in between,it's a soothing lotion and will help in stop itching.
But if the itch is getting worse or spreading to other parts of the body especially in the night then I would suspect scabies
,and for that you ll have to see a GP so that he can prescribe 5% Permethrin lotion which the Trearment of scabies along with Calamine lotion and Zyrtec.You shouldn't be applying Hydrocortisone
I hope that will help.