Final answer:
The symptoms described are suggestive of scabies, a condition caused by microscopic mites that burrow into the skin and cause intense itching. Treatment includes topical medications to kill the mites and eggs.
Step-by-step explanation:
The symptoms described in the question, including multiple excoriations on the arms, especially at the creases, and itching at night, are suggestive of a condition called scabies. Scabies is caused by a microscopic mite that burrows into the skin and causes intense itching, particularly at night. It is commonly seen in children and can be easily transmitted through close physical contact.
The treatment for scabies includes topical medications that kill the mites and eggs, such as permethrin cream. In addition to treating the affected individual, it is important to also treat all close contacts to prevent re-infestation.