Hi, thanks for your query.
You have a contagious rash
with severe itching
affecting all family members.
You have not mentioned the duration and the type of rash.
I think it to be scabies
. The mites spread through skin-to-skin contact with an infected person or by sharing towels, bed linens, and other objects. The itching is very severe and usually worse at night. The rash typically is seen on the sides and webs of the fingers, the wrist, elbows, genitals, and buttock.Bug bite
leaves itchy, red bites on the skin, usually on the arms or shoulders.
Flea bite leaves behind inflamed, itchy red bumps, usually around the the ankles and feet. Associated with pets at home.
You may consult a dermatologist
for exact diagnosis and treatment.
Hope this helps you.