Worsening of itch at night time and the sites of involvement point towards scabies
This is an contagious disease. You may spread it to the people staying under the same roof. It spreads by direct contact like hand shaking and through clothes, linens also.
Single application of a scabicidal cream/lotion will cure the disease.
Important thing to note here is to treat all the members staying with you, and second thing is to keep in mind that its itch may persist for longer duration despite completing the treatment.
Take a dermatology opinion.
Dr. Ajit Singh