It seems that you may be having lichen urticatus..also known as papular urticatus. There is erythematous papular eruptions on trunk and extremities with mild to severe itching
.It is hypersensitive reaction due to insects like bed bug,mosquito , ticks, flea..etc
Take antihistaminic,antibiotics and steroids
in tappering dose.Calamine
lotion may be applied to sooth the skin.
Avoid soap bath.
You may consult dermatologist
I hope you got my answer.
Dr. Ilyas Patel MD